// Copyright 2015 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 . package discover import ( "bytes" "crypto/ecdsa" crand "crypto/rand" "encoding/binary" "encoding/hex" "errors" "io" "math/rand" "net" "reflect" "sync" "testing" "time" "github.com/davecgh/go-spew/spew" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/crypto" "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" ) // shared test variables var ( futureExp = uint64(time.Now().Add(10 * time.Hour).Unix()) testTarget = encPubkey{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1} testRemote = rpcEndpoint{IP: net.ParseIP("1.1.1.1").To4(), UDP: 1, TCP: 2} testLocalAnnounced = rpcEndpoint{IP: net.ParseIP("2.2.2.2").To4(), UDP: 3, TCP: 4} testLocal = rpcEndpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6} ) type udpTest struct { t *testing.T pipe *dgramPipe table *Table db *enode.DB udp *UDPv4 sent [][]byte localkey, remotekey *ecdsa.PrivateKey remoteaddr *net.UDPAddr } func newUDPTest(t *testing.T) *udpTest { test := &udpTest{ t: t, pipe: newpipe(), localkey: newkey(), remotekey: newkey(), remoteaddr: &net.UDPAddr{IP: net.IP{10, 0, 1, 99}, Port: 30303}, } test.db, _ = enode.OpenDB("") ln := enode.NewLocalNode(test.db, test.localkey) test.udp, _ = ListenV4(test.pipe, ln, Config{ PrivateKey: test.localkey, Log: testlog.Logger(t, log.LvlTrace), }) test.table = test.udp.tab // Wait for initial refresh so the table doesn't send unexpected findnode. <-test.table.initDone return test } func (test *udpTest) close() { test.udp.Close() test.db.Close() } // handles a packet as if it had been sent to the transport. func (test *udpTest) packetIn(wantError error, data packetV4) { test.t.Helper() 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, data packetV4) { test.t.Helper() enc, _, err := test.udp.encode(key, data) if err != nil { 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 { test.t.Errorf("error mismatch: got %q, want %q", err, wantError) } } // waits for a packet to be sent by the transport. // validate should have type func(X, *net.UDPAddr, []byte), where X is a packet type. func (test *udpTest) waitPacketOut(validate interface{}) (closed bool) { test.t.Helper() dgram, err := test.pipe.receive() if err == errClosed { return true } else if err != nil { test.t.Error("packet receive error:", err) return false } p, _, hash, err := decodeV4(dgram.data) if err != nil { test.t.Errorf("sent packet decode error: %v", err) return false } fn := reflect.ValueOf(validate) exptype := fn.Type().In(0) if !reflect.TypeOf(p).AssignableTo(exptype) { test.t.Errorf("sent packet type mismatch, got: %v, want: %v", reflect.TypeOf(p), exptype) return false } fn.Call([]reflect.Value{reflect.ValueOf(p), reflect.ValueOf(&dgram.to), reflect.ValueOf(hash)}) return false } func TestUDPv4_packetErrors(t *testing.T) { test := newUDPTest(t) defer test.close() 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) { t.Parallel() test := newUDPTest(t) defer test.close() 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 { 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) defer test.close() rand.Seed(time.Now().UnixNano()) randomDuration := func(max time.Duration) time.Duration { return time.Duration(rand.Int63n(int64(max))) } var ( nReqs = 200 nTimeouts = 0 // number of requests with ptype > 128 nilErr = make(chan error, nReqs) // for requests that get a reply timeoutErr = make(chan error, nReqs) // for requests that time out ) for i := 0; i < nReqs; i++ { // Create a matcher for a random request in udp.loop. Requests // with ptype <= 128 will not get a reply and should time out. // For all other requests, a reply is scheduled to arrive // within the timeout window. p := &replyMatcher{ ptype: byte(rand.Intn(255)), callback: func(interface{}) (bool, bool) { return true, true }, } binary.BigEndian.PutUint64(p.from[:], uint64(i)) if p.ptype <= 128 { p.errc = timeoutErr test.udp.addReplyMatcher <- p nTimeouts++ } else { p.errc = nilErr test.udp.addReplyMatcher <- p time.AfterFunc(randomDuration(60*time.Millisecond), func() { if !test.udp.handleReply(p.from, p.ip, testPacket(p.ptype)) { t.Logf("not matched: %v", p) } }) } time.Sleep(randomDuration(30 * time.Millisecond)) } // Check that all timeouts were delivered and that the rest got nil errors. // The replies must be delivered. var ( recvDeadline = time.After(20 * time.Second) nTimeoutsRecv, nNil = 0, 0 ) for i := 0; i < nReqs; i++ { select { case err := <-timeoutErr: if err != errTimeout { t.Fatalf("got non-timeout error on timeoutErr %d: %v", i, err) } nTimeoutsRecv++ case err := <-nilErr: if err != nil { t.Fatalf("got non-nil error on nilErr %d: %v", i, err) } nNil++ case <-recvDeadline: t.Fatalf("exceeded recv deadline") } } if nTimeoutsRecv != nTimeouts { t.Errorf("wrong number of timeout errors received: got %d, want %d", nTimeoutsRecv, nTimeouts) } if nNil != nReqs-nTimeouts { t.Errorf("wrong number of successful replies: got %d, want %d", nNil, nReqs-nTimeouts) } } func TestUDPv4_findnodeTimeout(t *testing.T) { t.Parallel() test := newUDPTest(t) defer test.close() toaddr := &net.UDPAddr{IP: net.ParseIP("1.2.3.4"), Port: 2222} toid := enode.ID{1, 2, 3, 4} target := encPubkey{4, 5, 6, 7} result, err := test.udp.findnode(toid, toaddr, target) if err != errTimeout { t.Error("expected timeout error, got", err) } if len(result) > 0 { t.Error("expected empty result, got", result) } } func TestUDPv4_findnode(t *testing.T) { test := newUDPTest(t) defer test.close() // put a few nodes into the table. their exact // distribution shouldn't matter much, although we need to // take care not to overflow any bucket. nodes := &nodesByDistance{target: testTarget.id()} live := make(map[enode.ID]bool) numCandidates := 2 * bucketSize for i := 0; i < numCandidates; i++ { key := newkey() ip := net.IP{10, 13, 0, byte(i)} n := wrapNode(enode.NewV4(&key.PublicKey, ip, 0, 2000)) // Ensure half of table content isn't verified live yet. if i > numCandidates/2 { n.livenessChecks = 1 live[n.ID()] = true } nodes.push(n, numCandidates) } fillTable(test.table, nodes.entries) // ensure there's a bond with the test node, // findnode won't be accepted otherwise. remoteID := encodePubkey(&test.remotekey.PublicKey).id() test.table.db.UpdateLastPongReceived(remoteID, test.remoteaddr.IP, time.Now()) // check that closest neighbors are returned. expected := test.table.closest(testTarget.id(), bucketSize, true) 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) { t.Errorf("wrong number of results: got %d, want %d", len(p.Nodes), bucketSize) } for i, n := range p.Nodes { if n.ID.id() != want[i].ID() { t.Errorf("result mismatch at %d:\n got: %v\n want: %v", i, n, expected.entries[i]) } if !live[n.ID.id()] { t.Errorf("result includes dead node %v", n.ID.id()) } } }) } // Receive replies. want := expected.entries if len(want) > maxNeighbors { waitNeighbors(want[:maxNeighbors]) want = want[maxNeighbors:] } waitNeighbors(want) } func TestUDPv4_findnodeMultiReply(t *testing.T) { test := newUDPTest(t) defer test.close() rid := enode.PubkeyToIDV4(&test.remotekey.PublicKey) test.table.db.UpdateLastPingReceived(rid, test.remoteaddr.IP, time.Now()) // queue a pending findnode request resultc, errc := make(chan []*node), make(chan error) go func() { rid := encodePubkey(&test.remotekey.PublicKey).id() ns, err := test.udp.findnode(rid, test.remoteaddr, testTarget) if err != nil && len(ns) == 0 { errc <- err } else { resultc <- ns } }() // wait for the findnode to be sent. // after it is sent, the transport is waiting for a reply test.waitPacketOut(func(p *findnodeV4, to *net.UDPAddr, hash []byte) { if p.Target != testTarget { t.Errorf("wrong target: got %v, want %v", p.Target, testTarget) } }) // send the reply as two packets. list := []*node{ wrapNode(enode.MustParse("enode://ba85011c70bcc5c04d8607d3a0ed29aa6179c092cbdda10d5d32684fb33ed01bd94f588ca8f91ac48318087dcb02eaf36773a7a453f0eedd6742af668097b29c@10.0.1.16:30303?discport=30304")), wrapNode(enode.MustParse("enode://81fa361d25f157cd421c60dcc28d8dac5ef6a89476633339c5df30287474520caca09627da18543d9079b5b288698b542d56167aa5c09111e55acdbbdf2ef799@10.0.1.16:30303")), wrapNode(enode.MustParse("enode://9bffefd833d53fac8e652415f4973bee289e8b1a5c6c4cbe70abf817ce8a64cee11b823b66a987f51aaa9fba0d6a91b3e6bf0d5a5d1042de8e9eeea057b217f8@10.0.1.36:30301?discport=17")), wrapNode(enode.MustParse("enode://1b5b4aa662d7cb44a7221bfba67302590b643028197a7d5214790f3bac7aaa4a3241be9e83c09cf1f6c69d007c634faae3dc1b1221793e8446c0b3a09de65960@10.0.1.16:30303")), } rpclist := make([]rpcNode, len(list)) for i := range list { rpclist[i] = nodeToRPC(list[i]) } 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 { case result := <-resultc: want := append(list[:2], list[3:]...) if !reflect.DeepEqual(result, want) { t.Errorf("neighbors mismatch:\n got: %v\n want: %v", result, want) } case err := <-errc: t.Errorf("findnode error: %v", err) case <-time.After(5 * time.Second): t.Error("findnode did not return within 5 seconds") } } // This test checks that reply matching of pong verifies the ping hash. func TestUDPv4_pingMatch(t *testing.T) { test := newUDPTest(t) defer test.close() randToken := make([]byte, 32) crand.Read(randToken) 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, &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, &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, &pongV4{ ReplyTok: hash, To: testLocalAnnounced, Expiration: futureExp, }) }) } func TestUDPv4_successfulPing(t *testing.T) { test := newUDPTest(t) added := make(chan *node, 1) test.table.nodeAddedHook = func(n *node) { added <- n } defer test.close() // The remote side sends a ping packet to initiate the exchange. go test.packetIn(nil, &pingV4{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp}) // 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) { t.Errorf("got pong.ReplyTok %x, want %x", p.ReplyTok, pinghash) } wantTo := rpcEndpoint{ // The mirrored UDP address is the UDP packet sender IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port), // The mirrored TCP port is the one from the ping packet TCP: testRemote.TCP, } if !reflect.DeepEqual(p.To, wantTo) { t.Errorf("got pong.To %v, want %v", p.To, wantTo) } }) // 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()) } wantTo := rpcEndpoint{ // The mirrored UDP address is the UDP packet sender. IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port), TCP: 0, } if !reflect.DeepEqual(p.To, wantTo) { t.Errorf("got ping.To %v, want %v", p.To, wantTo) } test.packetIn(nil, &pongV4{ReplyTok: hash, Expiration: futureExp}) }) // The node should be added to the table shortly after getting the // pong packet. select { case n := <-added: rid := encodePubkey(&test.remotekey.PublicKey).id() if n.ID() != rid { t.Errorf("node has wrong ID: got %v, want %v", n.ID(), rid) } if !n.IP().Equal(test.remoteaddr.IP) { t.Errorf("node has wrong IP: got %v, want: %v", n.IP(), test.remoteaddr.IP) } if n.UDP() != test.remoteaddr.Port { t.Errorf("node has wrong UDP port: got %v, want: %v", n.UDP(), test.remoteaddr.Port) } if n.TCP() != int(testRemote.TCP) { t.Errorf("node has wrong TCP port: got %v, want: %v", n.TCP(), testRemote.TCP) } case <-time.After(2 * time.Second): t.Errorf("node was not added within 2 seconds") } } // 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{} }{ { input: "71dbda3a79554728d4f94411e42ee1f8b0d561c10e1e5f5893367948c6a7d70bb87b235fa28a77070271b6c164a2dce8c7e13a5739b53b5e96f2e5acb0e458a02902f5965d55ecbeb2ebb6cabb8b2b232896a36b737666c55265ad0a68412f250001ea04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a355", wantPacket: &pingV4{ Version: 4, From: rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544}, To: rpcEndpoint{net.ParseIP("::1"), 2222, 3333}, Expiration: 1136239445, Rest: []rlp.RawValue{}, }, }, { input: "e9614ccfd9fc3e74360018522d30e1419a143407ffcce748de3e22116b7e8dc92ff74788c0b6663aaa3d67d641936511c8f8d6ad8698b820a7cf9e1be7155e9a241f556658c55428ec0563514365799a4be2be5a685a80971ddcfa80cb422cdd0101ec04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a3550102", wantPacket: &pingV4{ Version: 4, From: rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544}, To: rpcEndpoint{net.ParseIP("::1"), 2222, 3333}, Expiration: 1136239445, Rest: []rlp.RawValue{{0x01}, {0x02}}, }, }, { input: "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", wantPacket: &pingV4{ Version: 555, From: rpcEndpoint{net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 3322, 5544}, To: rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338}, Expiration: 1136239445, Rest: []rlp.RawValue{{0xC5, 0x01, 0x02, 0x03, 0x04, 0x05}}, }, }, { input: "09b2428d83348d27cdf7064ad9024f526cebc19e4958f0fdad87c15eb598dd61d08423e0bf66b2069869e1724125f820d851c136684082774f870e614d95a2855d000f05d1648b2d5945470bc187c2d2216fbe870f43ed0909009882e176a46b0102f846d79020010db885a308d313198a2e037073488208ae82823aa0fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c9548443b9a355c6010203c2040506a0c969a58f6f9095004c0177a6b47f451530cab38966a25cca5cb58f055542124e", wantPacket: &pongV4{ To: rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338}, ReplyTok: common.Hex2Bytes("fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c954"), Expiration: 1136239445, Rest: []rlp.RawValue{{0xC6, 0x01, 0x02, 0x03, 0xC2, 0x04, 0x05}, {0x06}}, }, }, { input: "c7c44041b9f7c7e41934417ebac9a8e1a4c6298f74553f2fcfdcae6ed6fe53163eb3d2b52e39fe91831b8a927bf4fc222c3902202027e5e9eb812195f95d20061ef5cd31d502e47ecb61183f74a504fe04c51e73df81f25c4d506b26db4517490103f84eb840ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f8443b9a35582999983999999280dc62cc8255c73471e0a61da0c89acdc0e035e260add7fc0c04ad9ebf3919644c91cb247affc82b69bd2ca235c71eab8e49737c937a2c396", wantPacket: &findnodeV4{ Target: hexEncPubkey("ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f"), Expiration: 1136239445, Rest: []rlp.RawValue{{0x82, 0x99, 0x99}, {0x83, 0x99, 0x99, 0x99}}, }, }, { input: "c679fc8fe0b8b12f06577f2e802d34f6fa257e6137a995f6f4cbfc9ee50ed3710faf6e66f932c4c8d81d64343f429651328758b47d3dbc02c4042f0fff6946a50f4a49037a72bb550f3a7872363a83e1b9ee6469856c24eb4ef80b7535bcf99c0004f9015bf90150f84d846321163782115c82115db8403155e1427f85f10a5c9a7755877748041af1bcd8d474ec065eb33df57a97babf54bfd2103575fa829115d224c523596b401065a97f74010610fce76382c0bf32f84984010203040101b840312c55512422cf9b8a4097e9a6ad79402e87a15ae909a4bfefa22398f03d20951933beea1e4dfa6f968212385e829f04c2d314fc2d4e255e0d3bc08792b069dbf8599020010db83c4d001500000000abcdef12820d05820d05b84038643200b172dcfef857492156971f0e6aa2c538d8b74010f8e140811d53b98c765dd2d96126051913f44582e8c199ad7c6d6819e9a56483f637feaac9448aacf8599020010db885a308d313198a2e037073488203e78203e8b8408dcab8618c3253b558d459da53bd8fa68935a719aff8b811197101a4b2b47dd2d47295286fc00cc081bb542d760717d1bdd6bec2c37cd72eca367d6dd3b9df738443b9a355010203b525a138aa34383fec3d2719a0", wantPacket: &neighborsV4{ Nodes: []rpcNode{ { ID: hexEncPubkey("3155e1427f85f10a5c9a7755877748041af1bcd8d474ec065eb33df57a97babf54bfd2103575fa829115d224c523596b401065a97f74010610fce76382c0bf32"), IP: net.ParseIP("99.33.22.55").To4(), UDP: 4444, TCP: 4445, }, { ID: hexEncPubkey("312c55512422cf9b8a4097e9a6ad79402e87a15ae909a4bfefa22398f03d20951933beea1e4dfa6f968212385e829f04c2d314fc2d4e255e0d3bc08792b069db"), IP: net.ParseIP("1.2.3.4").To4(), UDP: 1, TCP: 1, }, { ID: hexEncPubkey("38643200b172dcfef857492156971f0e6aa2c538d8b74010f8e140811d53b98c765dd2d96126051913f44582e8c199ad7c6d6819e9a56483f637feaac9448aac"), IP: net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), UDP: 3333, TCP: 3333, }, { ID: hexEncPubkey("8dcab8618c3253b558d459da53bd8fa68935a719aff8b811197101a4b2b47dd2d47295286fc00cc081bb542d760717d1bdd6bec2c37cd72eca367d6dd3b9df73"), IP: net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), UDP: 999, TCP: 1000, }, }, Expiration: 1136239445, Rest: []rlp.RawValue{{0x01}, {0x02}, {0x03}}, }, }, } func TestUDPv4_forwardCompatibility(t *testing.T) { testkey, _ := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291") wantNodeKey := encodePubkey(&testkey.PublicKey) for _, test := range testPackets { input, err := hex.DecodeString(test.input) if err != nil { t.Fatalf("invalid hex: %s", test.input) } packet, nodekey, _, err := decodeV4(input) if err != nil { t.Errorf("did not accept packet %s\n%v", test.input, err) continue } if !reflect.DeepEqual(packet, test.wantPacket) { t.Errorf("got %s\nwant %s", spew.Sdump(packet), spew.Sdump(test.wantPacket)) } if nodekey != wantNodeKey { t.Errorf("got id %v\nwant id %v", nodekey, wantNodeKey) } } } // dgramPipe is a fake UDP socket. It queues all sent datagrams. type dgramPipe struct { mu *sync.Mutex cond *sync.Cond closing chan struct{} closed bool queue []dgram } type dgram struct { to net.UDPAddr data []byte } func newpipe() *dgramPipe { mu := new(sync.Mutex) return &dgramPipe{ closing: make(chan struct{}), cond: &sync.Cond{L: mu}, mu: mu, } } // WriteToUDP queues a datagram. func (c *dgramPipe) WriteToUDP(b []byte, to *net.UDPAddr) (n int, err error) { msg := make([]byte, len(b)) copy(msg, b) c.mu.Lock() defer c.mu.Unlock() if c.closed { return 0, errors.New("closed") } c.queue = append(c.queue, dgram{*to, b}) c.cond.Signal() return len(b), nil } // ReadFromUDP just hangs until the pipe is closed. func (c *dgramPipe) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) { <-c.closing return 0, nil, io.EOF } func (c *dgramPipe) Close() error { c.mu.Lock() defer c.mu.Unlock() if !c.closed { close(c.closing) c.closed = true } c.cond.Broadcast() return nil } func (c *dgramPipe) LocalAddr() net.Addr { return &net.UDPAddr{IP: testLocal.IP, Port: int(testLocal.UDP)} } func (c *dgramPipe) receive() (dgram, error) { c.mu.Lock() defer c.mu.Unlock() var timedOut bool timer := time.AfterFunc(3*time.Second, func() { c.mu.Lock() timedOut = true c.mu.Unlock() c.cond.Broadcast() }) defer timer.Stop() for len(c.queue) == 0 && !c.closed && !timedOut { c.cond.Wait() } if c.closed { return dgram{}, errClosed } if timedOut { return dgram{}, errTimeout } p := c.queue[0] copy(c.queue, c.queue[1:]) c.queue = c.queue[:len(c.queue)-1] return p, nil }