p2p/discover: add liveness check in collectTableNodes (#28686)

* p2p/discover: add liveness check in collectTableNodes

* p2p/discover: fix test

* p2p/discover: rename to appendLiveNodes

* p2p/discover: add dedup logic back

* p2p/discover: simplify

* p2p/discover: fix issue found by test
This commit is contained in:
Felix Lange 2023-12-18 10:47:21 +01:00 committed by GitHub
parent edc864f9ba
commit 5b22a472d6
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7 changed files with 37 additions and 23 deletions

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@ -459,6 +459,26 @@ func (tab *Table) findnodeByID(target enode.ID, nresults int, preferLive bool) *
return nodes
}
// appendLiveNodes adds nodes at the given distance to the result slice.
func (tab *Table) appendLiveNodes(dist uint, result []*enode.Node) []*enode.Node {
if dist > 256 {
return result
}
if dist == 0 {
return append(result, tab.self())
}
tab.mutex.Lock()
defer tab.mutex.Unlock()
for _, n := range tab.bucketAtDistance(int(dist)).entries {
if n.livenessChecks >= 1 {
node := n.Node // avoid handing out pointer to struct field
result = append(result, &node)
}
}
return result
}
// len returns the number of nodes in the table.
func (tab *Table) len() (n int) {
tab.mutex.Lock()

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@ -199,7 +199,7 @@ func TestTable_findnodeByID(t *testing.T) {
tab, db := newTestTable(transport)
defer db.Close()
defer tab.close()
fillTable(tab, test.All)
fillTable(tab, test.All, true)
// check that closest(Target, N) returns nodes
result := tab.findnodeByID(test.Target, test.N, false).entries

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@ -109,8 +109,11 @@ func fillBucket(tab *Table, n *node) (last *node) {
// fillTable adds nodes the table to the end of their corresponding bucket
// if the bucket is not full. The caller must not hold tab.mutex.
func fillTable(tab *Table, nodes []*node) {
func fillTable(tab *Table, nodes []*node, setLive bool) {
for _, n := range nodes {
if setLive {
n.livenessChecks = 1
}
tab.addSeenNode(n)
}
}

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@ -40,7 +40,7 @@ func TestUDPv4_Lookup(t *testing.T) {
}
// Seed table with initial node.
fillTable(test.table, []*node{wrapNode(lookupTestnet.node(256, 0))})
fillTable(test.table, []*node{wrapNode(lookupTestnet.node(256, 0))}, true)
// Start the lookup.
resultC := make(chan []*enode.Node, 1)
@ -74,7 +74,7 @@ func TestUDPv4_LookupIterator(t *testing.T) {
for i := range lookupTestnet.dists[256] {
bootnodes[i] = wrapNode(lookupTestnet.node(256, i))
}
fillTable(test.table, bootnodes)
fillTable(test.table, bootnodes, true)
go serveTestnet(test, lookupTestnet)
// Create the iterator and collect the nodes it yields.
@ -109,7 +109,7 @@ func TestUDPv4_LookupIteratorClose(t *testing.T) {
for i := range lookupTestnet.dists[256] {
bootnodes[i] = wrapNode(lookupTestnet.node(256, i))
}
fillTable(test.table, bootnodes)
fillTable(test.table, bootnodes, true)
go serveTestnet(test, lookupTestnet)
it := test.udp.RandomNodes()

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@ -269,7 +269,7 @@ func TestUDPv4_findnode(t *testing.T) {
}
nodes.push(n, numCandidates)
}
fillTable(test.table, nodes.entries)
fillTable(test.table, nodes.entries, false)
// ensure there's a bond with the test node,
// findnode won't be accepted otherwise.

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@ -851,6 +851,7 @@ func (t *UDPv5) handleFindnode(p *v5wire.Findnode, fromID enode.ID, fromAddr *ne
// collectTableNodes creates a FINDNODE result set for the given distances.
func (t *UDPv5) collectTableNodes(rip net.IP, distances []uint, limit int) []*enode.Node {
var bn []*enode.Node
var nodes []*enode.Node
var processed = make(map[uint]struct{})
for _, dist := range distances {
@ -859,21 +860,11 @@ func (t *UDPv5) collectTableNodes(rip net.IP, distances []uint, limit int) []*en
if seen || dist > 256 {
continue
}
// Get the nodes.
var bn []*enode.Node
if dist == 0 {
bn = []*enode.Node{t.Self()}
} else if dist <= 256 {
t.tab.mutex.Lock()
bn = unwrapNodes(t.tab.bucketAtDistance(int(dist)).entries)
t.tab.mutex.Unlock()
}
processed[dist] = struct{}{}
// Apply some pre-checks to avoid sending invalid nodes.
for _, n := range bn {
// TODO livenessChecks > 1
for _, n := range t.tab.appendLiveNodes(dist, bn[:0]) {
// Apply some pre-checks to avoid sending invalid nodes.
// Note liveness is checked by appendLiveNodes.
if netutil.CheckRelayIP(rip, n.IP()) != nil {
continue
}

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@ -159,9 +159,9 @@ func TestUDPv5_findnodeHandling(t *testing.T) {
nodes253 := nodesAtDistance(test.table.self().ID(), 253, 16)
nodes249 := nodesAtDistance(test.table.self().ID(), 249, 4)
nodes248 := nodesAtDistance(test.table.self().ID(), 248, 10)
fillTable(test.table, wrapNodes(nodes253))
fillTable(test.table, wrapNodes(nodes249))
fillTable(test.table, wrapNodes(nodes248))
fillTable(test.table, wrapNodes(nodes253), true)
fillTable(test.table, wrapNodes(nodes249), true)
fillTable(test.table, wrapNodes(nodes248), true)
// Requesting with distance zero should return the node's own record.
test.packetIn(&v5wire.Findnode{ReqID: []byte{0}, Distances: []uint{0}})
@ -589,7 +589,7 @@ func TestUDPv5_lookup(t *testing.T) {
// Seed table with initial node.
initialNode := lookupTestnet.node(256, 0)
fillTable(test.table, []*node{wrapNode(initialNode)})
fillTable(test.table, []*node{wrapNode(initialNode)}, true)
// Start the lookup.
resultC := make(chan []*enode.Node, 1)