p2p/discover: add support for EIP-868 (v4 ENR extension) (#19540)
This change implements EIP-868. The UDPv4 transport announces support for the extension in ping/pong and handles enrRequest messages. There are two uses of the extension: If a remote node announces support for EIP-868 in their pong, node revalidation pulls the node's record. The Resolve method requests the record unconditionally.
This commit is contained in:
Felix Lange
GitHub
parent
8deec2e45a
commit
350a87dd3c
@ -53,7 +53,6 @@ const (
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bucketIPLimit, bucketSubnet = 2, 24 // at most 2 addresses from the same /24
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tableIPLimit, tableSubnet = 10, 24
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maxFindnodeFailures = 5 // Nodes exceeding this limit are dropped
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refreshInterval = 30 * time.Minute
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revalidateInterval = 10 * time.Second
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copyNodesInterval = 30 * time.Second
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@ -62,6 +61,9 @@ const (
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seedMaxAge = 5 * 24 * time.Hour
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)
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// Table is the 'node table', a Kademlia-like index of neighbor nodes. The table keeps
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// itself up-to-date by verifying the liveness of neighbors and requesting their node
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// records when announcements of a new record version are received.
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type Table struct {
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mutex sync.Mutex // protects buckets, bucket content, nursery, rand
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buckets [nBuckets]*bucket // index of known nodes by distance
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@ -80,12 +82,13 @@ type Table struct {
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nodeAddedHook func(*node) // for testing
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}
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// transport is implemented by UDP transports.
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// transport is implemented by the UDP transports.
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type transport interface {
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Self() *enode.Node
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lookupRandom() []*enode.Node
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lookupSelf() []*enode.Node
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ping(*enode.Node) error
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ping(*enode.Node) (seq uint64, err error)
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requestENR(*enode.Node) (*enode.Node, error)
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}
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// bucket contains nodes, ordered by their last activity. the entry
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@ -175,14 +178,16 @@ func (tab *Table) ReadRandomNodes(buf []*enode.Node) (n int) {
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return i + 1
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}
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// Resolve searches for a specific node with the given ID.
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// It returns nil if the node could not be found.
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func (tab *Table) Resolve(n *enode.Node) *enode.Node {
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// getNode returns the node with the given ID or nil if it isn't in the table.
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func (tab *Table) getNode(id enode.ID) *enode.Node {
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tab.mutex.Lock()
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cl := tab.closest(n.ID(), 1, false)
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tab.mutex.Unlock()
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if len(cl.entries) > 0 && cl.entries[0].ID() == n.ID() {
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return unwrapNode(cl.entries[0])
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defer tab.mutex.Unlock()
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b := tab.bucket(id)
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for _, e := range b.entries {
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if e.ID() == id {
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return unwrapNode(e)
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}
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}
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return nil
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}
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@ -226,7 +231,7 @@ func (tab *Table) refresh() <-chan struct{} {
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return done
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}
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// loop schedules refresh, revalidate runs and coordinates shutdown.
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// loop schedules runs of doRefresh, doRevalidate and copyLiveNodes.
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func (tab *Table) loop() {
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var (
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revalidate = time.NewTimer(tab.nextRevalidateTime())
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@ -288,9 +293,8 @@ loop:
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close(tab.closed)
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}
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// doRefresh performs a lookup for a random target to keep buckets
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// full. seed nodes are inserted if the table is empty (initial
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// bootstrap or discarded faulty peers).
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// doRefresh performs a lookup for a random target to keep buckets full. seed nodes are
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// inserted if the table is empty (initial bootstrap or discarded faulty peers).
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func (tab *Table) doRefresh(done chan struct{}) {
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defer close(done)
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@ -324,8 +328,8 @@ func (tab *Table) loadSeedNodes() {
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}
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}
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// doRevalidate checks that the last node in a random bucket is still live
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// and replaces or deletes the node if it isn't.
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// doRevalidate checks that the last node in a random bucket is still live and replaces or
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// deletes the node if it isn't.
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func (tab *Table) doRevalidate(done chan<- struct{}) {
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defer func() { done <- struct{}{} }()
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@ -336,7 +340,17 @@ func (tab *Table) doRevalidate(done chan<- struct{}) {
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}
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// Ping the selected node and wait for a pong.
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err := tab.net.ping(unwrapNode(last))
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remoteSeq, err := tab.net.ping(unwrapNode(last))
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// Also fetch record if the node replied and returned a higher sequence number.
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if last.Seq() < remoteSeq {
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n, err := tab.net.requestENR(unwrapNode(last))
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if err != nil {
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tab.log.Debug("ENR request failed", "id", last.ID(), "addr", last.addr(), "err", err)
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} else {
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last = &node{Node: *n, addedAt: last.addedAt, livenessChecks: last.livenessChecks}
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}
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}
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tab.mutex.Lock()
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defer tab.mutex.Unlock()
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@ -368,6 +368,34 @@ func TestTable_addSeenNode(t *testing.T) {
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checkIPLimitInvariant(t, tab)
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}
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// This test checks that ENR updates happen during revalidation. If a node in the table
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// announces a new sequence number, the new record should be pulled.
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func TestTable_revalidateSyncRecord(t *testing.T) {
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transport := newPingRecorder()
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tab, db := newTestTable(transport)
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<-tab.initDone
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defer db.Close()
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defer tab.close()
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// Insert a node.
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var r enr.Record
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r.Set(enr.IP(net.IP{127, 0, 0, 1}))
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id := enode.ID{1}
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n1 := wrapNode(enode.SignNull(&r, id))
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tab.addSeenNode(n1)
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// Update the node record.
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r.Set(enr.WithEntry("foo", "bar"))
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n2 := enode.SignNull(&r, id)
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transport.updateRecord(n2)
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tab.doRevalidate(make(chan struct{}, 1))
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intable := tab.getNode(id)
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if !reflect.DeepEqual(intable, n2) {
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t.Fatalf("table contains old record with seq %d, want seq %d", intable.Seq(), n2.Seq())
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}
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}
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// gen wraps quick.Value so it's easier to use.
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// it generates a random value of the given value's type.
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func gen(typ interface{}, rand *rand.Rand) interface{} {
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@ -98,6 +98,7 @@ func fillTable(tab *Table, nodes []*node) {
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type pingRecorder struct {
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mu sync.Mutex
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dead, pinged map[enode.ID]bool
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records map[enode.ID]*enode.Node
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n *enode.Node
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}
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@ -109,36 +110,51 @@ func newPingRecorder() *pingRecorder {
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return &pingRecorder{
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dead: make(map[enode.ID]bool),
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pinged: make(map[enode.ID]bool),
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records: make(map[enode.ID]*enode.Node),
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n: n,
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}
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}
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func (t *pingRecorder) Self() *enode.Node {
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return nullNode
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// setRecord updates a node record. Future calls to ping and
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// requestENR will return this record.
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func (t *pingRecorder) updateRecord(n *enode.Node) {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.records[n.ID()] = n
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}
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func (t *pingRecorder) ping(n *enode.Node) error {
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// Stubs to satisfy the transport interface.
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func (t *pingRecorder) Self() *enode.Node { return nullNode }
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func (t *pingRecorder) lookupSelf() []*enode.Node { return nil }
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func (t *pingRecorder) lookupRandom() []*enode.Node { return nil }
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func (t *pingRecorder) close() {}
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// ping simulates a ping request.
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func (t *pingRecorder) ping(n *enode.Node) (seq uint64, err error) {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.pinged[n.ID()] = true
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if t.dead[n.ID()] {
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return errTimeout
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} else {
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return nil
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return 0, errTimeout
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}
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if t.records[n.ID()] != nil {
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seq = t.records[n.ID()].Seq()
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}
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return seq, nil
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}
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func (t *pingRecorder) lookupSelf() []*enode.Node {
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return nil
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}
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// requestENR simulates an ENR request.
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func (t *pingRecorder) requestENR(n *enode.Node) (*enode.Node, error) {
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t.mu.Lock()
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defer t.mu.Unlock()
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func (t *pingRecorder) lookupRandom() []*enode.Node {
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return nil
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if t.dead[n.ID()] || t.records[n.ID()] == nil {
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return nil, errTimeout
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}
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return t.records[n.ID()], nil
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}
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func (t *pingRecorder) close() {}
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func hasDuplicates(slice []*node) bool {
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seen := make(map[enode.ID]bool)
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for i, e := range slice {
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@ -31,6 +31,7 @@ import (
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/enr"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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"github.com/ethereum/go-ethereum/rlp"
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)
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@ -47,12 +48,12 @@ var (
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errClosed = errors.New("socket closed")
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)
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// Timeouts
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const (
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respTimeout = 500 * time.Millisecond
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expiration = 20 * time.Second
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bondExpiration = 24 * time.Hour
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maxFindnodeFailures = 5 // nodes exceeding this limit are dropped
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ntpFailureThreshold = 32 // Continuous timeouts after which to check NTP
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ntpWarningCooldown = 10 * time.Minute // Minimum amount of time to pass before repeating NTP warning
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driftThreshold = 10 * time.Second // Allowed clock drift before warning user
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@ -69,6 +70,8 @@ const (
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p_pongV4
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p_findnodeV4
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p_neighborsV4
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p_enrRequestV4
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p_enrResponseV4
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)
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// RPC request structures
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@ -112,6 +115,21 @@ type (
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Rest []rlp.RawValue `rlp:"tail"`
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}
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// enrRequestV4 queries for the remote node's record.
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enrRequestV4 struct {
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Expiration uint64
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// Ignore additional fields (for forward compatibility).
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Rest []rlp.RawValue `rlp:"tail"`
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}
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// enrResponseV4 is the reply to enrRequestV4.
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enrResponseV4 struct {
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ReplyTok []byte // Hash of the enrRequest packet.
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Record enr.Record
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// Ignore additional fields (for forward compatibility).
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Rest []rlp.RawValue `rlp:"tail"`
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}
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rpcNode struct {
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IP net.IP // len 4 for IPv4 or 16 for IPv6
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UDP uint16 // for discovery protocol
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@ -126,14 +144,15 @@ type (
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}
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)
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// packet is implemented by all v4 protocol messages.
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// packetV4 is implemented by all v4 protocol messages.
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type packetV4 interface {
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// preverify checks whether the packet is valid and should be handled at all.
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preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error
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// handle handles the packet.
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handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []byte)
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// name returns the name of the packet for logging purposes.
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// packet name and type for logging purposes.
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name() string
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kind() byte
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}
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func makeEndpoint(addr *net.UDPAddr, tcpPort uint16) rpcEndpoint {
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@ -191,7 +210,7 @@ type UDPv4 struct {
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closing chan struct{}
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}
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// pending represents a pending reply.
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// replyMatcher represents a pending reply.
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//
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// Some implementations of the protocol wish to send more than one
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// reply packet to findnode. In general, any neighbors packet cannot
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@ -217,17 +236,20 @@ type replyMatcher struct {
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// errc receives nil when the callback indicates completion or an
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// error if no further reply is received within the timeout.
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errc chan<- error
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errc chan error
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// reply contains the most recent reply. This field is safe for reading after errc has
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// received a value.
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reply packetV4
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}
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type replyMatchFunc func(interface{}) (matched bool, requestDone bool)
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// reply is a reply packet from a certain node.
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type reply struct {
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from enode.ID
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ip net.IP
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ptype byte
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data packetV4
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// loop indicates whether there was
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// a matching request by sending on this channel.
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matched chan<- bool
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@ -377,7 +399,8 @@ func (t *UDPv4) lookupWorker(n *node, targetKey encPubkey, reply chan<- []*node)
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t.tab.delete(n)
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}
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} else if fails > 0 {
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t.db.UpdateFindFails(n.ID(), n.IP(), fails-1)
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// Reset failure counter because it counts _consecutive_ failures.
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t.db.UpdateFindFails(n.ID(), n.IP(), 0)
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}
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// Grab as many nodes as possible. Some of them might not be alive anymore, but we'll
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@ -388,23 +411,34 @@ func (t *UDPv4) lookupWorker(n *node, targetKey encPubkey, reply chan<- []*node)
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reply <- r
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}
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// Resolve searches for a specific node with the given ID.
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// It returns nil if the node could not be found.
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// Resolve searches for a specific node with the given ID and tries to get the most recent
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// version of the node record for it. It returns n if the node could not be resolved.
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func (t *UDPv4) Resolve(n *enode.Node) *enode.Node {
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// If the node is present in the local table, no
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// network interaction is required.
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if intab := t.tab.Resolve(n); intab != nil {
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return intab
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// Try asking directly. This works if the node is still responding on the endpoint we have.
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if rn, err := t.requestENR(n); err == nil {
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return rn
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}
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// Check table for the ID, we might have a newer version there.
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if intable := t.tab.getNode(n.ID()); intable != nil && intable.Seq() > n.Seq() {
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n = intable
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if rn, err := t.requestENR(n); err == nil {
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return rn
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}
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}
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// Otherwise perform a network lookup.
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var key *enode.Secp256k1
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if n.Load(key) != nil {
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return n // no secp256k1 key
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}
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result := t.LookupPubkey((*ecdsa.PublicKey)(key))
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for _, rn := range result {
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if rn.ID() == n.ID() {
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if rn, err := t.requestENR(rn); err == nil {
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return rn
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}
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}
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}
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// Otherwise, do a network lookup.
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hash := n.ID()
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result := t.LookupPubkey(n.Pubkey())
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for _, n := range result {
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if n.ID() == hash {
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return n
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}
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}
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return nil
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}
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func (t *UDPv4) ourEndpoint() rpcEndpoint {
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@ -414,28 +448,27 @@ func (t *UDPv4) ourEndpoint() rpcEndpoint {
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}
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// ping sends a ping message to the given node and waits for a reply.
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func (t *UDPv4) ping(n *enode.Node) error {
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return <-t.sendPing(n.ID(), &net.UDPAddr{IP: n.IP(), Port: n.UDP()}, nil)
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func (t *UDPv4) ping(n *enode.Node) (seq uint64, err error) {
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rm := t.sendPing(n.ID(), &net.UDPAddr{IP: n.IP(), Port: n.UDP()}, nil)
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if err = <-rm.errc; err == nil {
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seq = seqFromTail(rm.reply.(*pongV4).Rest)
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}
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return seq, err
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}
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// sendPing sends a ping message to the given node and invokes the callback
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// when the reply arrives.
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func (t *UDPv4) sendPing(toid enode.ID, toaddr *net.UDPAddr, callback func()) <-chan error {
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req := &pingV4{
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Version: 4,
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From: t.ourEndpoint(),
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To: makeEndpoint(toaddr, 0), // TODO: maybe use known TCP port from DB
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Expiration: uint64(time.Now().Add(expiration).Unix()),
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}
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packet, hash, err := t.encode(t.priv, p_pingV4, req)
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func (t *UDPv4) sendPing(toid enode.ID, toaddr *net.UDPAddr, callback func()) *replyMatcher {
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req := t.makePing(toaddr)
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packet, hash, err := t.encode(t.priv, req)
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if err != nil {
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errc := make(chan error, 1)
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errc <- err
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return errc
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return &replyMatcher{errc: errc}
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}
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// Add a matcher for the reply to the pending reply queue. Pongs are matched if they
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// reference the ping we're about to send.
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errc := t.pending(toid, toaddr.IP, p_pongV4, func(p interface{}) (matched bool, requestDone bool) {
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rm := t.pending(toid, toaddr.IP, p_pongV4, func(p interface{}) (matched bool, requestDone bool) {
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matched = bytes.Equal(p.(*pongV4).ReplyTok, hash)
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if matched && callback != nil {
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callback()
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@ -445,25 +478,30 @@ func (t *UDPv4) sendPing(toid enode.ID, toaddr *net.UDPAddr, callback func()) <-
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// Send the packet.
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t.localNode.UDPContact(toaddr)
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t.write(toaddr, toid, req.name(), packet)
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return errc
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return rm
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}
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func (t *UDPv4) makePing(toaddr *net.UDPAddr) *pingV4 {
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seq, _ := rlp.EncodeToBytes(t.localNode.Node().Seq())
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return &pingV4{
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Version: 4,
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From: t.ourEndpoint(),
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To: makeEndpoint(toaddr, 0),
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Expiration: uint64(time.Now().Add(expiration).Unix()),
|
||||
Rest: []rlp.RawValue{seq},
|
||||
}
|
||||
}
|
||||
|
||||
// findnode sends a findnode request to the given node and waits until
|
||||
// the node has sent up to k neighbors.
|
||||
func (t *UDPv4) findnode(toid enode.ID, toaddr *net.UDPAddr, target encPubkey) ([]*node, error) {
|
||||
// If we haven't seen a ping from the destination node for a while, it won't remember
|
||||
// our endpoint proof and reject findnode. Solicit a ping first.
|
||||
if time.Since(t.db.LastPingReceived(toid, toaddr.IP)) > bondExpiration {
|
||||
<-t.sendPing(toid, toaddr, nil)
|
||||
// Wait for them to ping back and process our pong.
|
||||
time.Sleep(respTimeout)
|
||||
}
|
||||
t.ensureBond(toid, toaddr)
|
||||
|
||||
// Add a matcher for 'neighbours' replies to the pending reply queue. The matcher is
|
||||
// active until enough nodes have been received.
|
||||
nodes := make([]*node, 0, bucketSize)
|
||||
nreceived := 0
|
||||
errc := t.pending(toid, toaddr.IP, p_neighborsV4, func(r interface{}) (matched bool, requestDone bool) {
|
||||
rm := t.pending(toid, toaddr.IP, p_neighborsV4, func(r interface{}) (matched bool, requestDone bool) {
|
||||
reply := r.(*neighborsV4)
|
||||
for _, rn := range reply.Nodes {
|
||||
nreceived++
|
||||
@ -476,16 +514,56 @@ func (t *UDPv4) findnode(toid enode.ID, toaddr *net.UDPAddr, target encPubkey) (
|
||||
}
|
||||
return true, nreceived >= bucketSize
|
||||
})
|
||||
t.send(toaddr, toid, p_findnodeV4, &findnodeV4{
|
||||
t.send(toaddr, toid, &findnodeV4{
|
||||
Target: target,
|
||||
Expiration: uint64(time.Now().Add(expiration).Unix()),
|
||||
})
|
||||
return nodes, <-errc
|
||||
return nodes, <-rm.errc
|
||||
}
|
||||
|
||||
// requestENR sends enrRequest to the given node and waits for a response.
|
||||
func (t *UDPv4) requestENR(n *enode.Node) (*enode.Node, error) {
|
||||
addr := &net.UDPAddr{IP: n.IP(), Port: n.UDP()}
|
||||
t.ensureBond(n.ID(), addr)
|
||||
|
||||
req := &enrRequestV4{
|
||||
Expiration: uint64(time.Now().Add(expiration).Unix()),
|
||||
}
|
||||
packet, hash, err := t.encode(t.priv, req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// Add a matcher for the reply to the pending reply queue. Responses are matched if
|
||||
// they reference the request we're about to send.
|
||||
rm := t.pending(n.ID(), addr.IP, p_enrResponseV4, func(r interface{}) (matched bool, requestDone bool) {
|
||||
matched = bytes.Equal(r.(*enrResponseV4).ReplyTok, hash)
|
||||
return matched, matched
|
||||
})
|
||||
// Send the packet and wait for the reply.
|
||||
t.write(addr, n.ID(), req.name(), packet)
|
||||
if err := <-rm.errc; err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// Verify the response record.
|
||||
respN, err := enode.New(enode.ValidSchemes, &rm.reply.(*enrResponseV4).Record)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if respN.ID() != n.ID() {
|
||||
return nil, fmt.Errorf("invalid ID in response record")
|
||||
}
|
||||
if respN.Seq() < n.Seq() {
|
||||
return n, nil // response record is older
|
||||
}
|
||||
if err := netutil.CheckRelayIP(addr.IP, respN.IP()); err != nil {
|
||||
return nil, fmt.Errorf("invalid IP in response record: %v", err)
|
||||
}
|
||||
return respN, nil
|
||||
}
|
||||
|
||||
// pending adds a reply matcher to the pending reply queue.
|
||||
// see the documentation of type replyMatcher for a detailed explanation.
|
||||
func (t *UDPv4) pending(id enode.ID, ip net.IP, ptype byte, callback replyMatchFunc) <-chan error {
|
||||
func (t *UDPv4) pending(id enode.ID, ip net.IP, ptype byte, callback replyMatchFunc) *replyMatcher {
|
||||
ch := make(chan error, 1)
|
||||
p := &replyMatcher{from: id, ip: ip, ptype: ptype, callback: callback, errc: ch}
|
||||
select {
|
||||
@ -494,15 +572,15 @@ func (t *UDPv4) pending(id enode.ID, ip net.IP, ptype byte, callback replyMatchF
|
||||
case <-t.closing:
|
||||
ch <- errClosed
|
||||
}
|
||||
return ch
|
||||
return p
|
||||
}
|
||||
|
||||
// handleReply dispatches a reply packet, invoking reply matchers. It returns
|
||||
// whether any matcher considered the packet acceptable.
|
||||
func (t *UDPv4) handleReply(from enode.ID, fromIP net.IP, ptype byte, req packetV4) bool {
|
||||
func (t *UDPv4) handleReply(from enode.ID, fromIP net.IP, req packetV4) bool {
|
||||
matched := make(chan bool, 1)
|
||||
select {
|
||||
case t.gotreply <- reply{from, fromIP, ptype, req, matched}:
|
||||
case t.gotreply <- reply{from, fromIP, req, matched}:
|
||||
// loop will handle it
|
||||
return <-matched
|
||||
case <-t.closing:
|
||||
@ -565,11 +643,12 @@ func (t *UDPv4) loop() {
|
||||
var matched bool // whether any replyMatcher considered the reply acceptable.
|
||||
for el := plist.Front(); el != nil; el = el.Next() {
|
||||
p := el.Value.(*replyMatcher)
|
||||
if p.from == r.from && p.ptype == r.ptype && p.ip.Equal(r.ip) {
|
||||
if p.from == r.from && p.ptype == r.data.kind() && p.ip.Equal(r.ip) {
|
||||
ok, requestDone := p.callback(r.data)
|
||||
matched = matched || ok
|
||||
// Remove the matcher if callback indicates that all replies have been received.
|
||||
if requestDone {
|
||||
p.reply = r.data
|
||||
p.errc <- nil
|
||||
plist.Remove(el)
|
||||
}
|
||||
@ -635,8 +714,8 @@ func init() {
|
||||
}
|
||||
}
|
||||
|
||||
func (t *UDPv4) send(toaddr *net.UDPAddr, toid enode.ID, ptype byte, req packetV4) ([]byte, error) {
|
||||
packet, hash, err := t.encode(t.priv, ptype, req)
|
||||
func (t *UDPv4) send(toaddr *net.UDPAddr, toid enode.ID, req packetV4) ([]byte, error) {
|
||||
packet, hash, err := t.encode(t.priv, req)
|
||||
if err != nil {
|
||||
return hash, err
|
||||
}
|
||||
@ -649,18 +728,19 @@ func (t *UDPv4) write(toaddr *net.UDPAddr, toid enode.ID, what string, packet []
|
||||
return err
|
||||
}
|
||||
|
||||
func (t *UDPv4) encode(priv *ecdsa.PrivateKey, ptype byte, req interface{}) (packet, hash []byte, err error) {
|
||||
func (t *UDPv4) encode(priv *ecdsa.PrivateKey, req packetV4) (packet, hash []byte, err error) {
|
||||
name := req.name()
|
||||
b := new(bytes.Buffer)
|
||||
b.Write(headSpace)
|
||||
b.WriteByte(ptype)
|
||||
b.WriteByte(req.kind())
|
||||
if err := rlp.Encode(b, req); err != nil {
|
||||
t.log.Error("Can't encode discv4 packet", "err", err)
|
||||
t.log.Error(fmt.Sprintf("Can't encode %s packet", name), "err", err)
|
||||
return nil, nil, err
|
||||
}
|
||||
packet = b.Bytes()
|
||||
sig, err := crypto.Sign(crypto.Keccak256(packet[headSize:]), priv)
|
||||
if err != nil {
|
||||
t.log.Error("Can't sign discv4 packet", "err", err)
|
||||
t.log.Error(fmt.Sprintf("Can't sign %s packet", name), "err", err)
|
||||
return nil, nil, err
|
||||
}
|
||||
copy(packet[macSize:], sig)
|
||||
@ -743,6 +823,10 @@ func decodeV4(buf []byte) (packetV4, encPubkey, []byte, error) {
|
||||
req = new(findnodeV4)
|
||||
case p_neighborsV4:
|
||||
req = new(neighborsV4)
|
||||
case p_enrRequestV4:
|
||||
req = new(enrRequestV4)
|
||||
case p_enrResponseV4:
|
||||
req = new(enrResponseV4)
|
||||
default:
|
||||
return nil, fromKey, hash, fmt.Errorf("unknown type: %d", ptype)
|
||||
}
|
||||
@ -751,7 +835,41 @@ func decodeV4(buf []byte) (packetV4, encPubkey, []byte, error) {
|
||||
return req, fromKey, hash, err
|
||||
}
|
||||
|
||||
// Packet Handlers
|
||||
// checkBond checks if the given node has a recent enough endpoint proof.
|
||||
func (t *UDPv4) checkBond(id enode.ID, ip net.IP) bool {
|
||||
return time.Since(t.db.LastPongReceived(id, ip)) < bondExpiration
|
||||
}
|
||||
|
||||
// ensureBond solicits a ping from a node if we haven't seen a ping from it for a while.
|
||||
// This ensures there is a valid endpoint proof on the remote end.
|
||||
func (t *UDPv4) ensureBond(toid enode.ID, toaddr *net.UDPAddr) {
|
||||
tooOld := time.Since(t.db.LastPingReceived(toid, toaddr.IP)) > bondExpiration
|
||||
if tooOld || t.db.FindFails(toid, toaddr.IP) > maxFindnodeFailures {
|
||||
rm := t.sendPing(toid, toaddr, nil)
|
||||
<-rm.errc
|
||||
// Wait for them to ping back and process our pong.
|
||||
time.Sleep(respTimeout)
|
||||
}
|
||||
}
|
||||
|
||||
// expired checks whether the given UNIX time stamp is in the past.
|
||||
func expired(ts uint64) bool {
|
||||
return time.Unix(int64(ts), 0).Before(time.Now())
|
||||
}
|
||||
|
||||
func seqFromTail(tail []rlp.RawValue) uint64 {
|
||||
if len(tail) == 0 {
|
||||
return 0
|
||||
}
|
||||
var seq uint64
|
||||
rlp.DecodeBytes(tail[0], &seq)
|
||||
return seq
|
||||
}
|
||||
|
||||
// PING/v4
|
||||
|
||||
func (req *pingV4) name() string { return "PING/v4" }
|
||||
func (req *pingV4) kind() byte { return p_pingV4 }
|
||||
|
||||
func (req *pingV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error {
|
||||
if expired(req.Expiration) {
|
||||
@ -767,10 +885,12 @@ func (req *pingV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromK
|
||||
|
||||
func (req *pingV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []byte) {
|
||||
// Reply.
|
||||
t.send(from, fromID, p_pongV4, &pongV4{
|
||||
seq, _ := rlp.EncodeToBytes(t.localNode.Node().Seq())
|
||||
t.send(from, fromID, &pongV4{
|
||||
To: makeEndpoint(from, req.From.TCP),
|
||||
ReplyTok: mac,
|
||||
Expiration: uint64(time.Now().Add(expiration).Unix()),
|
||||
Rest: []rlp.RawValue{seq},
|
||||
})
|
||||
|
||||
// Ping back if our last pong on file is too far in the past.
|
||||
@ -788,13 +908,16 @@ func (req *pingV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []by
|
||||
t.localNode.UDPEndpointStatement(from, &net.UDPAddr{IP: req.To.IP, Port: int(req.To.UDP)})
|
||||
}
|
||||
|
||||
func (req *pingV4) name() string { return "PING/v4" }
|
||||
// PONG/v4
|
||||
|
||||
func (req *pongV4) name() string { return "PONG/v4" }
|
||||
func (req *pongV4) kind() byte { return p_pongV4 }
|
||||
|
||||
func (req *pongV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error {
|
||||
if expired(req.Expiration) {
|
||||
return errExpired
|
||||
}
|
||||
if !t.handleReply(fromID, from.IP, p_pongV4, req) {
|
||||
if !t.handleReply(fromID, from.IP, req) {
|
||||
return errUnsolicitedReply
|
||||
}
|
||||
return nil
|
||||
@ -805,13 +928,16 @@ func (req *pongV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []by
|
||||
t.db.UpdateLastPongReceived(fromID, from.IP, time.Now())
|
||||
}
|
||||
|
||||
func (req *pongV4) name() string { return "PONG/v4" }
|
||||
// FINDNODE/v4
|
||||
|
||||
func (req *findnodeV4) name() string { return "FINDNODE/v4" }
|
||||
func (req *findnodeV4) kind() byte { return p_findnodeV4 }
|
||||
|
||||
func (req *findnodeV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error {
|
||||
if expired(req.Expiration) {
|
||||
return errExpired
|
||||
}
|
||||
if time.Since(t.db.LastPongReceived(fromID, from.IP)) > bondExpiration {
|
||||
if !t.checkBond(fromID, from.IP) {
|
||||
// No endpoint proof pong exists, we don't process the packet. This prevents an
|
||||
// attack vector where the discovery protocol could be used to amplify traffic in a
|
||||
// DDOS attack. A malicious actor would send a findnode request with the IP address
|
||||
@ -839,23 +965,26 @@ func (req *findnodeV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac
|
||||
p.Nodes = append(p.Nodes, nodeToRPC(n))
|
||||
}
|
||||
if len(p.Nodes) == maxNeighbors {
|
||||
t.send(from, fromID, p_neighborsV4, &p)
|
||||
t.send(from, fromID, &p)
|
||||
p.Nodes = p.Nodes[:0]
|
||||
sent = true
|
||||
}
|
||||
}
|
||||
if len(p.Nodes) > 0 || !sent {
|
||||
t.send(from, fromID, p_neighborsV4, &p)
|
||||
t.send(from, fromID, &p)
|
||||
}
|
||||
}
|
||||
|
||||
func (req *findnodeV4) name() string { return "FINDNODE/v4" }
|
||||
// NEIGHBORS/v4
|
||||
|
||||
func (req *neighborsV4) name() string { return "NEIGHBORS/v4" }
|
||||
func (req *neighborsV4) kind() byte { return p_neighborsV4 }
|
||||
|
||||
func (req *neighborsV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error {
|
||||
if expired(req.Expiration) {
|
||||
return errExpired
|
||||
}
|
||||
if !t.handleReply(fromID, from.IP, p_neighborsV4, req) {
|
||||
if !t.handleReply(fromID, from.IP, req) {
|
||||
return errUnsolicitedReply
|
||||
}
|
||||
return nil
|
||||
@ -864,8 +993,39 @@ func (req *neighborsV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID,
|
||||
func (req *neighborsV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []byte) {
|
||||
}
|
||||
|
||||
func (req *neighborsV4) name() string { return "NEIGHBORS/v4" }
|
||||
// ENRREQUEST/v4
|
||||
|
||||
func expired(ts uint64) bool {
|
||||
return time.Unix(int64(ts), 0).Before(time.Now())
|
||||
func (req *enrRequestV4) name() string { return "ENRREQUEST/v4" }
|
||||
func (req *enrRequestV4) kind() byte { return p_enrRequestV4 }
|
||||
|
||||
func (req *enrRequestV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error {
|
||||
if expired(req.Expiration) {
|
||||
return errExpired
|
||||
}
|
||||
if !t.checkBond(fromID, from.IP) {
|
||||
return errUnknownNode
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (req *enrRequestV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []byte) {
|
||||
t.send(from, fromID, &enrResponseV4{
|
||||
ReplyTok: mac,
|
||||
Record: *t.localNode.Node().Record(),
|
||||
})
|
||||
}
|
||||
|
||||
// ENRRESPONSE/v4
|
||||
|
||||
func (req *enrResponseV4) name() string { return "ENRRESPONSE/v4" }
|
||||
func (req *enrResponseV4) kind() byte { return p_enrResponseV4 }
|
||||
|
||||
func (req *enrResponseV4) preverify(t *UDPv4, from *net.UDPAddr, fromID enode.ID, fromKey encPubkey) error {
|
||||
if !t.handleReply(fromID, from.IP, req) {
|
||||
return errUnsolicitedReply
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (req *enrResponseV4) handle(t *UDPv4, from *net.UDPAddr, fromID enode.ID, mac []byte) {
|
||||
}
|
||||
|
||||
@ -54,11 +54,11 @@ func TestUDPv4_Lookup(t *testing.T) {
|
||||
n, key := lookupTestnet.nodeByAddr(to)
|
||||
switch p.(type) {
|
||||
case *pingV4:
|
||||
test.packetInFrom(nil, key, to, p_pongV4, &pongV4{Expiration: futureExp, ReplyTok: hash})
|
||||
test.packetInFrom(nil, key, to, &pongV4{Expiration: futureExp, ReplyTok: hash})
|
||||
case *findnodeV4:
|
||||
dist := enode.LogDist(n.ID(), lookupTestnet.target.id())
|
||||
nodes := lookupTestnet.nodesAtDistance(dist - 1)
|
||||
test.packetInFrom(nil, key, to, p_neighborsV4, &neighborsV4{Expiration: futureExp, Nodes: nodes})
|
||||
test.packetInFrom(nil, key, to, &neighborsV4{Expiration: futureExp, Nodes: nodes})
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
@ -37,6 +37,7 @@ import (
|
||||
"github.com/ethereum/go-ethereum/internal/testlog"
|
||||
"github.com/ethereum/go-ethereum/log"
|
||||
"github.com/ethereum/go-ethereum/p2p/enode"
|
||||
"github.com/ethereum/go-ethereum/p2p/enr"
|
||||
"github.com/ethereum/go-ethereum/rlp"
|
||||
)
|
||||
|
||||
@ -91,19 +92,19 @@ func (test *udpTest) close() {
|
||||
}
|
||||
|
||||
// handles a packet as if it had been sent to the transport.
|
||||
func (test *udpTest) packetIn(wantError error, ptype byte, data packetV4) {
|
||||
func (test *udpTest) packetIn(wantError error, data packetV4) {
|
||||
test.t.Helper()
|
||||
|
||||
test.packetInFrom(wantError, test.remotekey, test.remoteaddr, ptype, data)
|
||||
test.packetInFrom(wantError, test.remotekey, test.remoteaddr, data)
|
||||
}
|
||||
|
||||
// handles a packet as if it had been sent to the transport by the key/endpoint.
|
||||
func (test *udpTest) packetInFrom(wantError error, key *ecdsa.PrivateKey, addr *net.UDPAddr, ptype byte, data packetV4) {
|
||||
func (test *udpTest) packetInFrom(wantError error, key *ecdsa.PrivateKey, addr *net.UDPAddr, data packetV4) {
|
||||
test.t.Helper()
|
||||
|
||||
enc, _, err := test.udp.encode(key, ptype, data)
|
||||
enc, _, err := test.udp.encode(key, data)
|
||||
if err != nil {
|
||||
test.t.Errorf("packet (%d) encode error: %v", ptype, err)
|
||||
test.t.Errorf("%s encode error: %v", data.name(), err)
|
||||
}
|
||||
test.sent = append(test.sent, enc)
|
||||
if err = test.udp.handlePacket(addr, enc); err != wantError {
|
||||
@ -139,10 +140,10 @@ func TestUDPv4_packetErrors(t *testing.T) {
|
||||
test := newUDPTest(t)
|
||||
defer test.close()
|
||||
|
||||
test.packetIn(errExpired, p_pingV4, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4})
|
||||
test.packetIn(errUnsolicitedReply, p_pongV4, &pongV4{ReplyTok: []byte{}, Expiration: futureExp})
|
||||
test.packetIn(errUnknownNode, p_findnodeV4, &findnodeV4{Expiration: futureExp})
|
||||
test.packetIn(errUnsolicitedReply, p_neighborsV4, &neighborsV4{Expiration: futureExp})
|
||||
test.packetIn(errExpired, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4})
|
||||
test.packetIn(errUnsolicitedReply, &pongV4{ReplyTok: []byte{}, Expiration: futureExp})
|
||||
test.packetIn(errUnknownNode, &findnodeV4{Expiration: futureExp})
|
||||
test.packetIn(errUnsolicitedReply, &neighborsV4{Expiration: futureExp})
|
||||
}
|
||||
|
||||
func TestUDPv4_pingTimeout(t *testing.T) {
|
||||
@ -153,11 +154,21 @@ func TestUDPv4_pingTimeout(t *testing.T) {
|
||||
key := newkey()
|
||||
toaddr := &net.UDPAddr{IP: net.ParseIP("1.2.3.4"), Port: 2222}
|
||||
node := enode.NewV4(&key.PublicKey, toaddr.IP, 0, toaddr.Port)
|
||||
if err := test.udp.ping(node); err != errTimeout {
|
||||
if _, err := test.udp.ping(node); err != errTimeout {
|
||||
t.Error("expected timeout error, got", err)
|
||||
}
|
||||
}
|
||||
|
||||
type testPacket byte
|
||||
|
||||
func (req testPacket) kind() byte { return byte(req) }
|
||||
func (req testPacket) name() string { return "" }
|
||||
func (req testPacket) preverify(*UDPv4, *net.UDPAddr, enode.ID, encPubkey) error {
|
||||
return nil
|
||||
}
|
||||
func (req testPacket) handle(*UDPv4, *net.UDPAddr, enode.ID, []byte) {
|
||||
}
|
||||
|
||||
func TestUDPv4_responseTimeouts(t *testing.T) {
|
||||
t.Parallel()
|
||||
test := newUDPTest(t)
|
||||
@ -192,7 +203,7 @@ func TestUDPv4_responseTimeouts(t *testing.T) {
|
||||
p.errc = nilErr
|
||||
test.udp.addReplyMatcher <- p
|
||||
time.AfterFunc(randomDuration(60*time.Millisecond), func() {
|
||||
if !test.udp.handleReply(p.from, p.ip, p.ptype, nil) {
|
||||
if !test.udp.handleReply(p.from, p.ip, testPacket(p.ptype)) {
|
||||
t.Logf("not matched: %v", p)
|
||||
}
|
||||
})
|
||||
@ -277,7 +288,7 @@ func TestUDPv4_findnode(t *testing.T) {
|
||||
|
||||
// check that closest neighbors are returned.
|
||||
expected := test.table.closest(testTarget.id(), bucketSize, true)
|
||||
test.packetIn(nil, p_findnodeV4, &findnodeV4{Target: testTarget, Expiration: futureExp})
|
||||
test.packetIn(nil, &findnodeV4{Target: testTarget, Expiration: futureExp})
|
||||
waitNeighbors := func(want []*node) {
|
||||
test.waitPacketOut(func(p *neighborsV4, to *net.UDPAddr, hash []byte) {
|
||||
if len(p.Nodes) != len(want) {
|
||||
@ -340,8 +351,8 @@ func TestUDPv4_findnodeMultiReply(t *testing.T) {
|
||||
for i := range list {
|
||||
rpclist[i] = nodeToRPC(list[i])
|
||||
}
|
||||
test.packetIn(nil, p_neighborsV4, &neighborsV4{Expiration: futureExp, Nodes: rpclist[:2]})
|
||||
test.packetIn(nil, p_neighborsV4, &neighborsV4{Expiration: futureExp, Nodes: rpclist[2:]})
|
||||
test.packetIn(nil, &neighborsV4{Expiration: futureExp, Nodes: rpclist[:2]})
|
||||
test.packetIn(nil, &neighborsV4{Expiration: futureExp, Nodes: rpclist[2:]})
|
||||
|
||||
// check that the sent neighbors are all returned by findnode
|
||||
select {
|
||||
@ -357,6 +368,7 @@ func TestUDPv4_findnodeMultiReply(t *testing.T) {
|
||||
}
|
||||
}
|
||||
|
||||
// This test checks that reply matching of pong verifies the ping hash.
|
||||
func TestUDPv4_pingMatch(t *testing.T) {
|
||||
test := newUDPTest(t)
|
||||
defer test.close()
|
||||
@ -364,22 +376,23 @@ func TestUDPv4_pingMatch(t *testing.T) {
|
||||
randToken := make([]byte, 32)
|
||||
crand.Read(randToken)
|
||||
|
||||
test.packetIn(nil, p_pingV4, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
|
||||
test.packetIn(nil, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
|
||||
test.waitPacketOut(func(*pongV4, *net.UDPAddr, []byte) {})
|
||||
test.waitPacketOut(func(*pingV4, *net.UDPAddr, []byte) {})
|
||||
test.packetIn(errUnsolicitedReply, p_pongV4, &pongV4{ReplyTok: randToken, To: testLocalAnnounced, Expiration: futureExp})
|
||||
test.packetIn(errUnsolicitedReply, &pongV4{ReplyTok: randToken, To: testLocalAnnounced, Expiration: futureExp})
|
||||
}
|
||||
|
||||
// This test checks that reply matching of pong verifies the sender IP address.
|
||||
func TestUDPv4_pingMatchIP(t *testing.T) {
|
||||
test := newUDPTest(t)
|
||||
defer test.close()
|
||||
|
||||
test.packetIn(nil, p_pingV4, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
|
||||
test.packetIn(nil, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
|
||||
test.waitPacketOut(func(*pongV4, *net.UDPAddr, []byte) {})
|
||||
|
||||
test.waitPacketOut(func(p *pingV4, to *net.UDPAddr, hash []byte) {
|
||||
wrongAddr := &net.UDPAddr{IP: net.IP{33, 44, 1, 2}, Port: 30000}
|
||||
test.packetInFrom(errUnsolicitedReply, test.remotekey, wrongAddr, p_pongV4, &pongV4{
|
||||
test.packetInFrom(errUnsolicitedReply, test.remotekey, wrongAddr, &pongV4{
|
||||
ReplyTok: hash,
|
||||
To: testLocalAnnounced,
|
||||
Expiration: futureExp,
|
||||
@ -394,9 +407,9 @@ func TestUDPv4_successfulPing(t *testing.T) {
|
||||
defer test.close()
|
||||
|
||||
// The remote side sends a ping packet to initiate the exchange.
|
||||
go test.packetIn(nil, p_pingV4, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
|
||||
go test.packetIn(nil, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
|
||||
|
||||
// the ping is replied to.
|
||||
// The ping is replied to.
|
||||
test.waitPacketOut(func(p *pongV4, to *net.UDPAddr, hash []byte) {
|
||||
pinghash := test.sent[0][:macSize]
|
||||
if !bytes.Equal(p.ReplyTok, pinghash) {
|
||||
@ -413,7 +426,7 @@ func TestUDPv4_successfulPing(t *testing.T) {
|
||||
}
|
||||
})
|
||||
|
||||
// remote is unknown, the table pings back.
|
||||
// Remote is unknown, the table pings back.
|
||||
test.waitPacketOut(func(p *pingV4, to *net.UDPAddr, hash []byte) {
|
||||
if !reflect.DeepEqual(p.From, test.udp.ourEndpoint()) {
|
||||
t.Errorf("got ping.From %#v, want %#v", p.From, test.udp.ourEndpoint())
|
||||
@ -427,10 +440,10 @@ func TestUDPv4_successfulPing(t *testing.T) {
|
||||
if !reflect.DeepEqual(p.To, wantTo) {
|
||||
t.Errorf("got ping.To %v, want %v", p.To, wantTo)
|
||||
}
|
||||
test.packetIn(nil, p_pongV4, &pongV4{ReplyTok: hash, Expiration: futureExp})
|
||||
test.packetIn(nil, &pongV4{ReplyTok: hash, Expiration: futureExp})
|
||||
})
|
||||
|
||||
// the node should be added to the table shortly after getting the
|
||||
// The node should be added to the table shortly after getting the
|
||||
// pong packet.
|
||||
select {
|
||||
case n := <-added:
|
||||
@ -452,6 +465,45 @@ func TestUDPv4_successfulPing(t *testing.T) {
|
||||
}
|
||||
}
|
||||
|
||||
// This test checks that EIP-868 requests work.
|
||||
func TestUDPv4_EIP868(t *testing.T) {
|
||||
test := newUDPTest(t)
|
||||
defer test.close()
|
||||
|
||||
test.udp.localNode.Set(enr.WithEntry("foo", "bar"))
|
||||
wantNode := test.udp.localNode.Node()
|
||||
|
||||
// ENR requests aren't allowed before endpoint proof.
|
||||
test.packetIn(errUnknownNode, &enrRequestV4{Expiration: futureExp})
|
||||
|
||||
// Perform endpoint proof and check for sequence number in packet tail.
|
||||
test.packetIn(nil, &pingV4{Expiration: futureExp})
|
||||
test.waitPacketOut(func(p *pongV4, addr *net.UDPAddr, hash []byte) {
|
||||
if seq := seqFromTail(p.Rest); seq != wantNode.Seq() {
|
||||
t.Errorf("wrong sequence number in pong: %d, want %d", seq, wantNode.Seq())
|
||||
}
|
||||
})
|
||||
test.waitPacketOut(func(p *pingV4, addr *net.UDPAddr, hash []byte) {
|
||||
if seq := seqFromTail(p.Rest); seq != wantNode.Seq() {
|
||||
t.Errorf("wrong sequence number in ping: %d, want %d", seq, wantNode.Seq())
|
||||
}
|
||||
test.packetIn(nil, &pongV4{Expiration: futureExp, ReplyTok: hash})
|
||||
})
|
||||
|
||||
// Request should work now.
|
||||
test.packetIn(nil, &enrRequestV4{Expiration: futureExp})
|
||||
test.waitPacketOut(func(p *enrResponseV4, addr *net.UDPAddr, hash []byte) {
|
||||
n, err := enode.New(enode.ValidSchemes, &p.Record)
|
||||
if err != nil {
|
||||
t.Fatalf("invalid record: %v", err)
|
||||
}
|
||||
if !reflect.DeepEqual(n, wantNode) {
|
||||
t.Fatalf("wrong node in enrResponse: %v", n)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// EIP-8 test vectors.
|
||||
var testPackets = []struct {
|
||||
input string
|
||||
wantPacket interface{}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user