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go-ethereum/p2p/discv5/udp_test.go

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p2p/discv5: added new topic discovery package
2016-10-19 14:04:55 +03:00
// 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 <http://www.gnu.org/licenses/>.
package discv5
import (
"encoding/hex"
"errors"
"io"
"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/rlp"
)
func init() {
spew.Config.DisableMethods = true
}
// This test checks that isPacketTooBig correctly identifies
// errors that result from receiving a UDP packet larger
// than the supplied receive buffer.
func TestIsPacketTooBig(t *testing.T) {
listener, err := net.ListenPacket("udp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
defer listener.Close()
sender, err := net.Dial("udp", listener.LocalAddr().String())
if err != nil {
t.Fatal(err)
}
defer sender.Close()
sendN := 1800
recvN := 300
for i := 0; i < 20; i++ {
go func() {
buf := make([]byte, sendN)
for i := range buf {
buf[i] = byte(i)
}
sender.Write(buf)
}()
buf := make([]byte, recvN)
listener.SetDeadline(time.Now().Add(1 * time.Second))
n, _, err := listener.ReadFrom(buf)
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
continue
}
if !isPacketTooBig(err) {
t.Fatal("unexpected read error:", spew.Sdump(err))
}
continue
}
if n != recvN {
t.Fatalf("short read: %d, want %d", n, recvN)
}
for i := range buf {
if buf[i] != byte(i) {
t.Fatalf("error in pattern")
break
}
}
}
}
// shared test variables
var (
futureExp = uint64(time.Now().Add(10 * time.Hour).Unix())
testTarget = NodeID{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
// udp *udp
// 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{1, 2, 3, 4}, Port: 30303},
// }
// test.table, test.udp, _ = newUDP(test.localkey, test.pipe, nil, "")
// return test
// }
//
// // handles a packet as if it had been sent to the transport.
// func (test *udpTest) packetIn(wantError error, ptype byte, data packet) error {
// enc, err := encodePacket(test.remotekey, ptype, data)
// if err != nil {
// return test.errorf("packet (%d) encode error: %v", ptype, err)
// }
// test.sent = append(test.sent, enc)
// if err = test.udp.handlePacket(test.remoteaddr, enc); err != wantError {
// return test.errorf("error mismatch: got %q, want %q", err, wantError)
// }
// return nil
// }
//
// // waits for a packet to be sent by the transport.
// // validate should have type func(*udpTest, X) error, where X is a packet type.
// func (test *udpTest) waitPacketOut(validate interface{}) error {
// dgram := test.pipe.waitPacketOut()
// p, _, _, err := decodePacket(dgram)
// if err != nil {
// return test.errorf("sent packet decode error: %v", err)
// }
// fn := reflect.ValueOf(validate)
// exptype := fn.Type().In(0)
// if reflect.TypeOf(p) != exptype {
// return test.errorf("sent packet type mismatch, got: %v, want: %v", reflect.TypeOf(p), exptype)
// }
// fn.Call([]reflect.Value{reflect.ValueOf(p)})
// return nil
// }
//
// func (test *udpTest) errorf(format string, args ...interface{}) error {
// _, file, line, ok := runtime.Caller(2) // errorf + waitPacketOut
// if ok {
// file = filepath.Base(file)
// } else {
// file = "???"
// line = 1
// }
// err := fmt.Errorf(format, args...)
// fmt.Printf("\t%s:%d: %v\n", file, line, err)
// test.t.Fail()
// return err
// }
//
// func TestUDP_packetErrors(t *testing.T) {
// test := newUDPTest(t)
// defer test.table.Close()
//
// test.packetIn(errExpired, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: Version})
// test.packetIn(errUnsolicitedReply, pongPacket, &pong{ReplyTok: []byte{}, Expiration: futureExp})
// test.packetIn(errUnknownNode, findnodePacket, &findnode{Expiration: futureExp})
// test.packetIn(errUnsolicitedReply, neighborsPacket, &neighbors{Expiration: futureExp})
// }
//
// func TestUDP_findnode(t *testing.T) {
// test := newUDPTest(t)
// defer test.table.Close()
//
// // put a few nodes into the table. their exact
// // distribution shouldn't matter much, altough we need to
// // take care not to overflow any bucket.
// targetHash := crypto.Keccak256Hash(testTarget[:])
// nodes := &nodesByDistance{target: targetHash}
// for i := 0; i < bucketSize; i++ {
// nodes.push(nodeAtDistance(test.table.self.sha, i+2), bucketSize)
// }
// test.table.stuff(nodes.entries)
//
// // ensure there's a bond with the test node,
// // findnode won't be accepted otherwise.
// test.table.db.updateNode(NewNode(
// PubkeyID(&test.remotekey.PublicKey),
// test.remoteaddr.IP,
// uint16(test.remoteaddr.Port),
// 99,
// ))
// // check that closest neighbors are returned.
// test.packetIn(nil, findnodePacket, &findnode{Target: testTarget, Expiration: futureExp})
// expected := test.table.closest(targetHash, bucketSize)
//
// waitNeighbors := func(want []*Node) {
// test.waitPacketOut(func(p *neighbors) {
// if len(p.Nodes) != len(want) {
// t.Errorf("wrong number of results: got %d, want %d", len(p.Nodes), bucketSize)
// }
// for i := range p.Nodes {
// if p.Nodes[i].ID != want[i].ID {
// t.Errorf("result mismatch at %d:\n got: %v\n want: %v", i, p.Nodes[i], expected.entries[i])
// }
// }
// })
// }
// waitNeighbors(expected.entries[:maxNeighbors])
// waitNeighbors(expected.entries[maxNeighbors:])
// }
//
// func TestUDP_findnodeMultiReply(t *testing.T) {
// test := newUDPTest(t)
// defer test.table.Close()
//
// // queue a pending findnode request
// resultc, errc := make(chan []*Node), make(chan error)
// go func() {
// rid := PubkeyID(&test.remotekey.PublicKey)
// 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 *findnode) {
// if p.Target != testTarget {
// t.Errorf("wrong target: got %v, want %v", p.Target, testTarget)
// }
// })
//
// // send the reply as two packets.
// list := []*Node{
// MustParseNode("enode://ba85011c70bcc5c04d8607d3a0ed29aa6179c092cbdda10d5d32684fb33ed01bd94f588ca8f91ac48318087dcb02eaf36773a7a453f0eedd6742af668097b29c@10.0.1.16:30303?discport=30304"),
// MustParseNode("enode://81fa361d25f157cd421c60dcc28d8dac5ef6a89476633339c5df30287474520caca09627da18543d9079b5b288698b542d56167aa5c09111e55acdbbdf2ef799@10.0.1.16:30303"),
// MustParseNode("enode://9bffefd833d53fac8e652415f4973bee289e8b1a5c6c4cbe70abf817ce8a64cee11b823b66a987f51aaa9fba0d6a91b3e6bf0d5a5d1042de8e9eeea057b217f8@10.0.1.36:30301?discport=17"),
// MustParseNode("enode://1b5b4aa662d7cb44a7221bfba67302590b643028197a7d5214790f3bac7aaa4a3241be9e83c09cf1f6c69d007c634faae3dc1b1221793e8446c0b3a09de65960@10.0.1.16:30303"),
// }
// rpclist := make([]rpcNode, len(list))
// for i := range list {
// rpclist[i] = nodeToRPC(list[i])
// }
// test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[:2]})
// test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[2:]})
//
// // check that the sent neighbors are all returned by findnode
// select {
// case result := <-resultc:
// if !reflect.DeepEqual(result, list) {
// t.Errorf("neighbors mismatch:\n got: %v\n want: %v", result, list)
// }
// case err := <-errc:
// t.Errorf("findnode error: %v", err)
// case <-time.After(5 * time.Second):
// t.Error("findnode did not return within 5 seconds")
// }
// }
//
// func TestUDP_successfulPing(t *testing.T) {
// test := newUDPTest(t)
// added := make(chan *Node, 1)
// test.table.nodeAddedHook = func(n *Node) { added <- n }
// defer test.table.Close()
//
// // The remote side sends a ping packet to initiate the exchange.
// go test.packetIn(nil, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: Version, Expiration: futureExp})
//
// // the ping is replied to.
// test.waitPacketOut(func(p *pong) {
// 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 *ping) error {
// 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)
// }
// return nil
// })
// test.packetIn(nil, pongPacket, &pong{Expiration: futureExp})
//
// // the node should be added to the table shortly after getting the
// // pong packet.
// select {
// case n := <-added:
// rid := PubkeyID(&test.remotekey.PublicKey)
// if n.ID != rid {
// t.Errorf("node has wrong ID: got %v, want %v", n.ID, rid)
// }
// if !bytes.Equal(n.IP, test.remoteaddr.IP) {
// t.Errorf("node has wrong IP: got %v, want: %v", n.IP, test.remoteaddr.IP)
// }
// if int(n.UDP) != test.remoteaddr.Port {
// t.Errorf("node has wrong UDP port: got %v, want: %v", n.UDP, test.remoteaddr.Port)
// }
// if n.TCP != 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")
// }
// }
var testPackets = []struct {
input string
wantPacket interface{}
}{
{
input: "71dbda3a79554728d4f94411e42ee1f8b0d561c10e1e5f5893367948c6a7d70bb87b235fa28a77070271b6c164a2dce8c7e13a5739b53b5e96f2e5acb0e458a02902f5965d55ecbeb2ebb6cabb8b2b232896a36b737666c55265ad0a68412f250001ea04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a355",
wantPacket: &ping{
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: &ping{
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: &ping{
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: &pong{
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: &findnode{
Target: MustHexID("ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f"),
Expiration: 1136239445,
Rest: []rlp.RawValue{{0x82, 0x99, 0x99}, {0x83, 0x99, 0x99, 0x99}},
},
},
{
input: "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",
wantPacket: &neighbors{
Nodes: []rpcNode{
{
ID: MustHexID("3155e1427f85f10a5c9a7755877748041af1bcd8d474ec065eb33df57a97babf54bfd2103575fa829115d224c523596b401065a97f74010610fce76382c0bf32"),
IP: net.ParseIP("99.33.22.55").To4(),
UDP: 4444,
TCP: 4445,
},
{
ID: MustHexID("312c55512422cf9b8a4097e9a6ad79402e87a15ae909a4bfefa22398f03d20951933beea1e4dfa6f968212385e829f04c2d314fc2d4e255e0d3bc08792b069db"),
IP: net.ParseIP("1.2.3.4").To4(),
UDP: 1,
TCP: 1,
},
{
ID: MustHexID("38643200b172dcfef857492156971f0e6aa2c538d8b74010f8e140811d53b98c765dd2d96126051913f44582e8c199ad7c6d6819e9a56483f637feaac9448aac"),
IP: net.ParseIP("2001:db8:3c4d:15::abcd:ef12"),
UDP: 3333,
TCP: 3333,
},
{
ID: MustHexID("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 TestForwardCompatibility(t *testing.T) {
t.Skip("skipped while working on discovery v5")
testkey, _ := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
wantNodeID := PubkeyID(&testkey.PublicKey)
for _, test := range testPackets {
input, err := hex.DecodeString(test.input)
if err != nil {
t.Fatalf("invalid hex: %s", test.input)
}
var pkt ingressPacket
if err := decodePacket(input, &pkt); err != nil {
t.Errorf("did not accept packet %s\n%v", test.input, err)
continue
}
if !reflect.DeepEqual(pkt.data, test.wantPacket) {
t.Errorf("got %s\nwant %s", spew.Sdump(pkt.data), spew.Sdump(test.wantPacket))
}
if pkt.remoteID != wantNodeID {
t.Errorf("got id %v\nwant id %v", pkt.remoteID, wantNodeID)
}
}
}
// 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 [][]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, msg)
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
}
return nil
}
func (c *dgramPipe) LocalAddr() net.Addr {
return &net.UDPAddr{IP: testLocal.IP, Port: int(testLocal.UDP)}
}
func (c *dgramPipe) waitPacketOut() []byte {
c.mu.Lock()
defer c.mu.Unlock()
for len(c.queue) == 0 {
c.cond.Wait()
}
p := c.queue[0]
copy(c.queue, c.queue[1:])
c.queue = c.queue[:len(c.queue)-1]
return p
}
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