github.com/impedro29/bor@v0.1.4/p2p/discover/v4_udp_lookup_test.go (about)

     1  // Copyright 2019 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package discover
    18  
    19  import (
    20  	"crypto/ecdsa"
    21  	"fmt"
    22  	"net"
    23  	"reflect"
    24  	"sort"
    25  	"testing"
    26  
    27  	"github.com/maticnetwork/bor/crypto"
    28  	"github.com/maticnetwork/bor/p2p/enode"
    29  )
    30  
    31  func TestUDPv4_Lookup(t *testing.T) {
    32  	t.Parallel()
    33  	test := newUDPTest(t)
    34  
    35  	// Lookup on empty table returns no nodes.
    36  	targetKey, _ := decodePubkey(lookupTestnet.target)
    37  	if results := test.udp.LookupPubkey(targetKey); len(results) > 0 {
    38  		t.Fatalf("lookup on empty table returned %d results: %#v", len(results), results)
    39  	}
    40  
    41  	// Seed table with initial node.
    42  	fillTable(test.table, []*node{wrapNode(lookupTestnet.node(256, 0))})
    43  
    44  	// Start the lookup.
    45  	resultC := make(chan []*enode.Node, 1)
    46  	go func() {
    47  		resultC <- test.udp.LookupPubkey(targetKey)
    48  		test.close()
    49  	}()
    50  
    51  	// Answer lookup packets.
    52  	for done := false; !done; {
    53  		done = test.waitPacketOut(func(p packetV4, to *net.UDPAddr, hash []byte) {
    54  			n, key := lookupTestnet.nodeByAddr(to)
    55  			switch p.(type) {
    56  			case *pingV4:
    57  				test.packetInFrom(nil, key, to, &pongV4{Expiration: futureExp, ReplyTok: hash})
    58  			case *findnodeV4:
    59  				dist := enode.LogDist(n.ID(), lookupTestnet.target.id())
    60  				nodes := lookupTestnet.nodesAtDistance(dist - 1)
    61  				test.packetInFrom(nil, key, to, &neighborsV4{Expiration: futureExp, Nodes: nodes})
    62  			}
    63  		})
    64  	}
    65  
    66  	// Verify result nodes.
    67  	results := <-resultC
    68  	t.Logf("results:")
    69  	for _, e := range results {
    70  		t.Logf("  ld=%d, %x", enode.LogDist(lookupTestnet.target.id(), e.ID()), e.ID().Bytes())
    71  	}
    72  	if len(results) != bucketSize {
    73  		t.Errorf("wrong number of results: got %d, want %d", len(results), bucketSize)
    74  	}
    75  	if hasDuplicates(wrapNodes(results)) {
    76  		t.Errorf("result set contains duplicate entries")
    77  	}
    78  	if !sortedByDistanceTo(lookupTestnet.target.id(), wrapNodes(results)) {
    79  		t.Errorf("result set not sorted by distance to target")
    80  	}
    81  	if !reflect.DeepEqual(results, lookupTestnet.closest(bucketSize)) {
    82  		t.Errorf("results aren't the closest %d nodes", bucketSize)
    83  	}
    84  }
    85  
    86  // This is the test network for the Lookup test.
    87  // The nodes were obtained by running lookupTestnet.mine with a random NodeID as target.
    88  var lookupTestnet = &preminedTestnet{
    89  	target: hexEncPubkey("5d485bdcbe9bc89314a10ae9231e429d33853e3a8fa2af39f5f827370a2e4185e344ace5d16237491dad41f278f1d3785210d29ace76cd627b9147ee340b1125"),
    90  	dists: [257][]*ecdsa.PrivateKey{
    91  		251: {
    92  			hexEncPrivkey("29738ba0c1a4397d6a65f292eee07f02df8e58d41594ba2be3cf84ce0fc58169"),
    93  			hexEncPrivkey("511b1686e4e58a917f7f848e9bf5539d206a68f5ad6b54b552c2399fe7d174ae"),
    94  			hexEncPrivkey("d09e5eaeec0fd596236faed210e55ef45112409a5aa7f3276d26646080dcfaeb"),
    95  			hexEncPrivkey("c1e20dbbf0d530e50573bd0a260b32ec15eb9190032b4633d44834afc8afe578"),
    96  			hexEncPrivkey("ed5f38f5702d92d306143e5d9154fb21819777da39af325ea359f453d179e80b"),
    97  		},
    98  		252: {
    99  			hexEncPrivkey("1c9b1cafbec00848d2c174b858219914b42a7d5c9359b1ca03fd650e8239ae94"),
   100  			hexEncPrivkey("e0e1e8db4a6f13c1ffdd3e96b72fa7012293ced187c9dcdcb9ba2af37a46fa10"),
   101  			hexEncPrivkey("3d53823e0a0295cb09f3e11d16c1b44d07dd37cec6f739b8df3a590189fe9fb9"),
   102  		},
   103  		253: {
   104  			hexEncPrivkey("2d0511ae9bf590166597eeab86b6f27b1ab761761eaea8965487b162f8703847"),
   105  			hexEncPrivkey("6cfbd7b8503073fc3dbdb746a7c672571648d3bd15197ccf7f7fef3d904f53a2"),
   106  			hexEncPrivkey("a30599b12827b69120633f15b98a7f6bc9fc2e9a0fd6ae2ebb767c0e64d743ab"),
   107  			hexEncPrivkey("14a98db9b46a831d67eff29f3b85b1b485bb12ae9796aea98d91be3dc78d8a91"),
   108  			hexEncPrivkey("2369ff1fc1ff8ca7d20b17e2673adc3365c3674377f21c5d9dafaff21fe12e24"),
   109  			hexEncPrivkey("9ae91101d6b5048607f41ec0f690ef5d09507928aded2410aabd9237aa2727d7"),
   110  			hexEncPrivkey("05e3c59090a3fd1ae697c09c574a36fcf9bedd0afa8fe3946f21117319ca4973"),
   111  			hexEncPrivkey("06f31c5ea632658f718a91a1b1b9ae4b7549d7b3bc61cbc2be5f4a439039f3ad"),
   112  		},
   113  		254: {
   114  			hexEncPrivkey("dec742079ec00ff4ec1284d7905bc3de2366f67a0769431fd16f80fd68c58a7c"),
   115  			hexEncPrivkey("ff02c8861fa12fbd129d2a95ea663492ef9c1e51de19dcfbbfe1c59894a28d2b"),
   116  			hexEncPrivkey("4dded9e4eefcbce4262be4fd9e8a773670ab0b5f448f286ec97dfc8cf681444a"),
   117  			hexEncPrivkey("750d931e2a8baa2c9268cb46b7cd851f4198018bed22f4dceb09dd334a2395f6"),
   118  			hexEncPrivkey("ce1435a956a98ffec484cd11489c4f165cf1606819ab6b521cee440f0c677e9e"),
   119  			hexEncPrivkey("996e7f8d1638be92d7328b4770f47e5420fc4bafecb4324fd33b1f5d9f403a75"),
   120  			hexEncPrivkey("ebdc44e77a6cc0eb622e58cf3bb903c3da4c91ca75b447b0168505d8fc308b9c"),
   121  			hexEncPrivkey("46bd1eddcf6431bea66fc19ebc45df191c1c7d6ed552dcdc7392885009c322f0"),
   122  		},
   123  		255: {
   124  			hexEncPrivkey("da8645f90826e57228d9ea72aff84500060ad111a5d62e4af831ed8e4b5acfb8"),
   125  			hexEncPrivkey("3c944c5d9af51d4c1d43f5d0f3a1a7ef65d5e82744d669b58b5fed242941a566"),
   126  			hexEncPrivkey("5ebcde76f1d579eebf6e43b0ffe9157e65ffaa391175d5b9aa988f47df3e33da"),
   127  			hexEncPrivkey("97f78253a7d1d796e4eaabce721febcc4550dd68fb11cc818378ba807a2cb7de"),
   128  			hexEncPrivkey("a38cd7dc9b4079d1c0406afd0fdb1165c285f2c44f946eca96fc67772c988c7d"),
   129  			hexEncPrivkey("d64cbb3ffdf712c372b7a22a176308ef8f91861398d5dbaf326fd89c6eaeef1c"),
   130  			hexEncPrivkey("d269609743ef29d6446e3355ec647e38d919c82a4eb5837e442efd7f4218944f"),
   131  			hexEncPrivkey("d8f7bcc4a530efde1d143717007179e0d9ace405ddaaf151c4d863753b7fd64c"),
   132  		},
   133  		256: {
   134  			hexEncPrivkey("8c5b422155d33ea8e9d46f71d1ad3e7b24cb40051413ffa1a81cff613d243ba9"),
   135  			hexEncPrivkey("937b1af801def4e8f5a3a8bd225a8bcff1db764e41d3e177f2e9376e8dd87233"),
   136  			hexEncPrivkey("120260dce739b6f71f171da6f65bc361b5fad51db74cf02d3e973347819a6518"),
   137  			hexEncPrivkey("1fa56cf25d4b46c2bf94e82355aa631717b63190785ac6bae545a88aadc304a9"),
   138  			hexEncPrivkey("3c38c503c0376f9b4adcbe935d5f4b890391741c764f61b03cd4d0d42deae002"),
   139  			hexEncPrivkey("3a54af3e9fa162bc8623cdf3e5d9b70bf30ade1d54cc3abea8659aba6cff471f"),
   140  			hexEncPrivkey("6799a02ea1999aefdcbcc4d3ff9544478be7365a328d0d0f37c26bd95ade0cda"),
   141  			hexEncPrivkey("e24a7bc9051058f918646b0f6e3d16884b2a55a15553b89bab910d55ebc36116"),
   142  		},
   143  	},
   144  }
   145  
   146  type preminedTestnet struct {
   147  	target encPubkey
   148  	dists  [hashBits + 1][]*ecdsa.PrivateKey
   149  }
   150  
   151  func (tn *preminedTestnet) node(dist, index int) *enode.Node {
   152  	key := tn.dists[dist][index]
   153  	ip := net.IP{127, byte(dist >> 8), byte(dist), byte(index)}
   154  	return enode.NewV4(&key.PublicKey, ip, 0, 5000)
   155  }
   156  
   157  func (tn *preminedTestnet) nodeByAddr(addr *net.UDPAddr) (*enode.Node, *ecdsa.PrivateKey) {
   158  	dist := int(addr.IP[1])<<8 + int(addr.IP[2])
   159  	index := int(addr.IP[3])
   160  	key := tn.dists[dist][index]
   161  	return tn.node(dist, index), key
   162  }
   163  
   164  func (tn *preminedTestnet) nodesAtDistance(dist int) []rpcNode {
   165  	result := make([]rpcNode, len(tn.dists[dist]))
   166  	for i := range result {
   167  		result[i] = nodeToRPC(wrapNode(tn.node(dist, i)))
   168  	}
   169  	return result
   170  }
   171  
   172  func (tn *preminedTestnet) closest(n int) (nodes []*enode.Node) {
   173  	for d := range tn.dists {
   174  		for i := range tn.dists[d] {
   175  			nodes = append(nodes, tn.node(d, i))
   176  		}
   177  	}
   178  	sort.Slice(nodes, func(i, j int) bool {
   179  		return enode.DistCmp(tn.target.id(), nodes[i].ID(), nodes[j].ID()) < 0
   180  	})
   181  	return nodes[:n]
   182  }
   183  
   184  var _ = (*preminedTestnet).mine // avoid linter warning about mine being dead code.
   185  
   186  // mine generates a testnet struct literal with nodes at
   187  // various distances to the network's target.
   188  func (tn *preminedTestnet) mine() {
   189  	// Clear existing slices first (useful when re-mining).
   190  	for i := range tn.dists {
   191  		tn.dists[i] = nil
   192  	}
   193  
   194  	targetSha := tn.target.id()
   195  	found, need := 0, 40
   196  	for found < need {
   197  		k := newkey()
   198  		ld := enode.LogDist(targetSha, encodePubkey(&k.PublicKey).id())
   199  		if len(tn.dists[ld]) < 8 {
   200  			tn.dists[ld] = append(tn.dists[ld], k)
   201  			found++
   202  			fmt.Printf("found ID with ld %d (%d/%d)\n", ld, found, need)
   203  		}
   204  	}
   205  	fmt.Printf("&preminedTestnet{\n")
   206  	fmt.Printf("	target: hexEncPubkey(\"%x\"),\n", tn.target[:])
   207  	fmt.Printf("	dists: [%d][]*ecdsa.PrivateKey{\n", len(tn.dists))
   208  	for ld, ns := range tn.dists {
   209  		if len(ns) == 0 {
   210  			continue
   211  		}
   212  		fmt.Printf("		%d: {\n", ld)
   213  		for _, key := range ns {
   214  			fmt.Printf("			hexEncPrivkey(\"%x\"),\n", crypto.FromECDSA(key))
   215  		}
   216  		fmt.Printf("		},\n")
   217  	}
   218  	fmt.Printf("	},\n")
   219  	fmt.Printf("}\n")
   220  }