// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discover
import (
"crypto/ecdsa"
"fmt"
"net"
"reflect"
"sort"
"testing"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/p2p/enode"
)
func TestUDPv4_Lookup(t *testing.T) {
t.Parallel()
test := newUDPTest(t)
// Lookup on empty table returns no nodes.
targetKey, _ := decodePubkey(lookupTestnet.target)
if results := test.udp.LookupPubkey(targetKey); len(results) > 0 {
t.Fatalf("lookup on empty table returned %d results: %#v", len(results), results)
}
// Seed table with initial node.
fillTable(test.table, []*node{wrapNode(lookupTestnet.node(256, 0))})
// Start the lookup.
resultC := make(chan []*enode.Node, 1)
go func() {
resultC <- test.udp.LookupPubkey(targetKey)
test.close()
}()
// Answer lookup packets.
for done := false; !done; {
done = test.waitPacketOut(func(p packetV4, to *net.UDPAddr, hash []byte) {
n, key := lookupTestnet.nodeByAddr(to)
switch p.(type) {
case *pingV4:
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, &neighborsV4{Expiration: futureExp, Nodes: nodes})
}
})
}
// Verify result nodes.
results := <-resultC
t.Logf("results:")
for _, e := range results {
t.Logf(" ld=%d, %x", enode.LogDist(lookupTestnet.target.id(), e.ID()), e.ID().Bytes())
}
if len(results) != bucketSize {
t.Errorf("wrong number of results: got %d, want %d", len(results), bucketSize)
}
if hasDuplicates(wrapNodes(results)) {
t.Errorf("result set contains duplicate entries")
}
if !sortedByDistanceTo(lookupTestnet.target.id(), wrapNodes(results)) {
t.Errorf("result set not sorted by distance to target")
}
if !reflect.DeepEqual(results, lookupTestnet.closest(bucketSize)) {
t.Errorf("results aren't the closest %d nodes", bucketSize)
}
}
// This is the test network for the Lookup test.
// The nodes were obtained by running lookupTestnet.mine with a random NodeID as target.
var lookupTestnet = &preminedTestnet{
target: hexEncPubkey("5d485bdcbe9bc89314a10ae9231e429d33853e3a8fa2af39f5f827370a2e4185e344ace5d16237491dad41f278f1d3785210d29ace76cd627b9147ee340b1125"),
dists: [257][]*ecdsa.PrivateKey{
251: {
hexEncPrivkey("29738ba0c1a4397d6a65f292eee07f02df8e58d41594ba2be3cf84ce0fc58169"),
hexEncPrivkey("511b1686e4e58a917f7f848e9bf5539d206a68f5ad6b54b552c2399fe7d174ae"),
hexEncPrivkey("d09e5eaeec0fd596236faed210e55ef45112409a5aa7f3276d26646080dcfaeb"),
hexEncPrivkey("c1e20dbbf0d530e50573bd0a260b32ec15eb9190032b4633d44834afc8afe578"),
hexEncPrivkey("ed5f38f5702d92d306143e5d9154fb21819777da39af325ea359f453d179e80b"),
},
252: {
hexEncPrivkey("1c9b1cafbec00848d2c174b858219914b42a7d5c9359b1ca03fd650e8239ae94"),
hexEncPrivkey("e0e1e8db4a6f13c1ffdd3e96b72fa7012293ced187c9dcdcb9ba2af37a46fa10"),
hexEncPrivkey("3d53823e0a0295cb09f3e11d16c1b44d07dd37cec6f739b8df3a590189fe9fb9"),
},
253: {
hexEncPrivkey("2d0511ae9bf590166597eeab86b6f27b1ab761761eaea8965487b162f8703847"),
hexEncPrivkey("6cfbd7b8503073fc3dbdb746a7c672571648d3bd15197ccf7f7fef3d904f53a2"),
hexEncPrivkey("a30599b12827b69120633f15b98a7f6bc9fc2e9a0fd6ae2ebb767c0e64d743ab"),
hexEncPrivkey("14a98db9b46a831d67eff29f3b85b1b485bb12ae9796aea98d91be3dc78d8a91"),
hexEncPrivkey("2369ff1fc1ff8ca7d20b17e2673adc3365c3674377f21c5d9dafaff21fe12e24"),
hexEncPrivkey("9ae91101d6b5048607f41ec0f690ef5d09507928aded2410aabd9237aa2727d7"),
hexEncPrivkey("05e3c59090a3fd1ae697c09c574a36fcf9bedd0afa8fe3946f21117319ca4973"),
hexEncPrivkey("06f31c5ea632658f718a91a1b1b9ae4b7549d7b3bc61cbc2be5f4a439039f3ad"),
},
254: {
hexEncPrivkey("dec742079ec00ff4ec1284d7905bc3de2366f67a0769431fd16f80fd68c58a7c"),
hexEncPrivkey("ff02c8861fa12fbd129d2a95ea663492ef9c1e51de19dcfbbfe1c59894a28d2b"),
hexEncPrivkey("4dded9e4eefcbce4262be4fd9e8a773670ab0b5f448f286ec97dfc8cf681444a"),
hexEncPrivkey("750d931e2a8baa2c9268cb46b7cd851f4198018bed22f4dceb09dd334a2395f6"),
hexEncPrivkey("ce1435a956a98ffec484cd11489c4f165cf1606819ab6b521cee440f0c677e9e"),
hexEncPrivkey("996e7f8d1638be92d7328b4770f47e5420fc4bafecb4324fd33b1f5d9f403a75"),
hexEncPrivkey("ebdc44e77a6cc0eb622e58cf3bb903c3da4c91ca75b447b0168505d8fc308b9c"),
hexEncPrivkey("46bd1eddcf6431bea66fc19ebc45df191c1c7d6ed552dcdc7392885009c322f0"),
},
255: {
hexEncPrivkey("da8645f90826e57228d9ea72aff84500060ad111a5d62e4af831ed8e4b5acfb8"),
hexEncPrivkey("3c944c5d9af51d4c1d43f5d0f3a1a7ef65d5e82744d669b58b5fed242941a566"),
hexEncPrivkey("5ebcde76f1d579eebf6e43b0ffe9157e65ffaa391175d5b9aa988f47df3e33da"),
hexEncPrivkey("97f78253a7d1d796e4eaabce721febcc4550dd68fb11cc818378ba807a2cb7de"),
hexEncPrivkey("a38cd7dc9b4079d1c0406afd0fdb1165c285f2c44f946eca96fc67772c988c7d"),
hexEncPrivkey("d64cbb3ffdf712c372b7a22a176308ef8f91861398d5dbaf326fd89c6eaeef1c"),
hexEncPrivkey("d269609743ef29d6446e3355ec647e38d919c82a4eb5837e442efd7f4218944f"),
hexEncPrivkey("d8f7bcc4a530efde1d143717007179e0d9ace405ddaaf151c4d863753b7fd64c"),
},
256: {
hexEncPrivkey("8c5b422155d33ea8e9d46f71d1ad3e7b24cb40051413ffa1a81cff613d243ba9"),
hexEncPrivkey("937b1af801def4e8f5a3a8bd225a8bcff1db764e41d3e177f2e9376e8dd87233"),
hexEncPrivkey("120260dce739b6f71f171da6f65bc361b5fad51db74cf02d3e973347819a6518"),
hexEncPrivkey("1fa56cf25d4b46c2bf94e82355aa631717b63190785ac6bae545a88aadc304a9"),
hexEncPrivkey("3c38c503c0376f9b4adcbe935d5f4b890391741c764f61b03cd4d0d42deae002"),
hexEncPrivkey("3a54af3e9fa162bc8623cdf3e5d9b70bf30ade1d54cc3abea8659aba6cff471f"),
hexEncPrivkey("6799a02ea1999aefdcbcc4d3ff9544478be7365a328d0d0f37c26bd95ade0cda"),
hexEncPrivkey("e24a7bc9051058f918646b0f6e3d16884b2a55a15553b89bab910d55ebc36116"),
},
},
}
type preminedTestnet struct {
target encPubkey
dists [hashBits + 1][]*ecdsa.PrivateKey
}
func (tn *preminedTestnet) node(dist, index int) *enode.Node {
key := tn.dists[dist][index]
ip := net.IP{127, byte(dist >> 8), byte(dist), byte(index)}
return enode.NewV4(&key.PublicKey, ip, 0, 5000)
}
func (tn *preminedTestnet) nodeByAddr(addr *net.UDPAddr) (*enode.Node, *ecdsa.PrivateKey) {
dist := int(addr.IP[1])<<8 + int(addr.IP[2])
index := int(addr.IP[3])
key := tn.dists[dist][index]
return tn.node(dist, index), key
}
func (tn *preminedTestnet) nodesAtDistance(dist int) []rpcNode {
result := make([]rpcNode, len(tn.dists[dist]))
for i := range result {
result[i] = nodeToRPC(wrapNode(tn.node(dist, i)))
}
return result
}
func (tn *preminedTestnet) closest(n int) (nodes []*enode.Node) {
for d := range tn.dists {
for i := range tn.dists[d] {
nodes = append(nodes, tn.node(d, i))
}
}
sort.Slice(nodes, func(i, j int) bool {
return enode.DistCmp(tn.target.id(), nodes[i].ID(), nodes[j].ID()) < 0
})
return nodes[:n]
}
var _ = (*preminedTestnet).mine // avoid linter warning about mine being dead code.
// mine generates a testnet struct literal with nodes at
// various distances to the network's target.
func (tn *preminedTestnet) mine() {
// Clear existing slices first (useful when re-mining).
for i := range tn.dists {
tn.dists[i] = nil
}
targetSha := tn.target.id()
found, need := 0, 40
for found < need {
k := newkey()
ld := enode.LogDist(targetSha, encodePubkey(&k.PublicKey).id())
if len(tn.dists[ld]) < 8 {
tn.dists[ld] = append(tn.dists[ld], k)
found++
fmt.Printf("found ID with ld %d (%d/%d)\n", ld, found, need)
}
}
fmt.Printf("&preminedTestnet{\n")
fmt.Printf(" target: hexEncPubkey(\"%x\"),\n", tn.target[:])
fmt.Printf(" dists: [%d][]*ecdsa.PrivateKey{\n", len(tn.dists))
for ld, ns := range tn.dists {
if len(ns) == 0 {
continue
}
fmt.Printf(" %d: {\n", ld)
for _, key := range ns {
fmt.Printf(" hexEncPrivkey(\"%x\"),\n", crypto.FromECDSA(key))
}
fmt.Printf(" },\n")
}
fmt.Printf(" },\n")
fmt.Printf("}\n")
}
