mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-25 21:07:17 +00:00
506 lines
19 KiB
Go
506 lines
19 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package discv5
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import (
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"encoding/hex"
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"errors"
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"io"
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"net"
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"reflect"
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"sync"
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"testing"
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"time"
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"github.com/davecgh/go-spew/spew"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/rlp"
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)
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func init() {
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spew.Config.DisableMethods = true
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}
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// This test checks that isPacketTooBig correctly identifies
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// errors that result from receiving a UDP packet larger
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// than the supplied receive buffer.
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func TestIsPacketTooBig(t *testing.T) {
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listener, err := net.ListenPacket("udp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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defer listener.Close()
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sender, err := net.Dial("udp", listener.LocalAddr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer sender.Close()
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sendN := 1800
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recvN := 300
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for i := 0; i < 20; i++ {
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go func() {
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buf := make([]byte, sendN)
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for i := range buf {
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buf[i] = byte(i)
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}
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sender.Write(buf)
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}()
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buf := make([]byte, recvN)
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listener.SetDeadline(time.Now().Add(1 * time.Second))
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n, _, err := listener.ReadFrom(buf)
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if err != nil {
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if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
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continue
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}
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if !isPacketTooBig(err) {
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t.Fatal("unexpected read error:", spew.Sdump(err))
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}
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continue
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}
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if n != recvN {
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t.Fatalf("short read: %d, want %d", n, recvN)
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}
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for i := range buf {
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if buf[i] != byte(i) {
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t.Fatalf("error in pattern")
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break
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}
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}
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}
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}
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// shared test variables
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var (
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futureExp = uint64(time.Now().Add(10 * time.Hour).Unix())
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testTarget = NodeID{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}
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testRemote = rpcEndpoint{IP: net.ParseIP("1.1.1.1").To4(), UDP: 1, TCP: 2}
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testLocalAnnounced = rpcEndpoint{IP: net.ParseIP("2.2.2.2").To4(), UDP: 3, TCP: 4}
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testLocal = rpcEndpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6}
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)
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// type udpTest struct {
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// t *testing.T
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// pipe *dgramPipe
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// table *Table
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// udp *udp
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// sent [][]byte
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// localkey, remotekey *ecdsa.PrivateKey
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// remoteaddr *net.UDPAddr
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// }
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//
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// func newUDPTest(t *testing.T) *udpTest {
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// test := &udpTest{
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// t: t,
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// pipe: newpipe(),
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// localkey: newkey(),
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// remotekey: newkey(),
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// remoteaddr: &net.UDPAddr{IP: net.IP{1, 2, 3, 4}, Port: 30303},
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// }
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// test.table, test.udp, _ = newUDP(test.localkey, test.pipe, nil, "")
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// return test
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// }
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//
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// // handles a packet as if it had been sent to the transport.
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// func (test *udpTest) packetIn(wantError error, ptype byte, data packet) error {
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// enc, err := encodePacket(test.remotekey, ptype, data)
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// if err != nil {
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// return test.errorf("packet (%d) encode error: %v", ptype, err)
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// }
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// test.sent = append(test.sent, enc)
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// if err = test.udp.handlePacket(test.remoteaddr, enc); err != wantError {
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// return test.errorf("error mismatch: got %q, want %q", err, wantError)
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// }
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// return nil
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// }
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//
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// // waits for a packet to be sent by the transport.
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// // validate should have type func(*udpTest, X) error, where X is a packet type.
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// func (test *udpTest) waitPacketOut(validate interface{}) error {
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// dgram := test.pipe.waitPacketOut()
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// p, _, _, err := decodePacket(dgram)
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// if err != nil {
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// return test.errorf("sent packet decode error: %v", err)
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// }
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// fn := reflect.ValueOf(validate)
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// exptype := fn.Type().In(0)
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// if reflect.TypeOf(p) != exptype {
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// return test.errorf("sent packet type mismatch, got: %v, want: %v", reflect.TypeOf(p), exptype)
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// }
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// fn.Call([]reflect.Value{reflect.ValueOf(p)})
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// return nil
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// }
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//
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// func (test *udpTest) errorf(format string, args ...interface{}) error {
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// _, file, line, ok := runtime.Caller(2) // errorf + waitPacketOut
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// if ok {
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// file = filepath.Base(file)
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// } else {
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// file = "???"
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// line = 1
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// }
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// err := fmt.Errorf(format, args...)
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// fmt.Printf("\t%s:%d: %v\n", file, line, err)
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// test.t.Fail()
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// return err
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// }
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//
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// func TestUDP_packetErrors(t *testing.T) {
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// test := newUDPTest(t)
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// defer test.table.Close()
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//
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// test.packetIn(errExpired, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: Version})
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// test.packetIn(errUnsolicitedReply, pongPacket, &pong{ReplyTok: []byte{}, Expiration: futureExp})
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// test.packetIn(errUnknownNode, findnodePacket, &findnode{Expiration: futureExp})
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// test.packetIn(errUnsolicitedReply, neighborsPacket, &neighbors{Expiration: futureExp})
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// }
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//
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// func TestUDP_findnode(t *testing.T) {
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// test := newUDPTest(t)
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// defer test.table.Close()
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//
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// // put a few nodes into the table. their exact
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// // distribution shouldn't matter much, altough we need to
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// // take care not to overflow any bucket.
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// targetHash := crypto.Keccak256Hash(testTarget[:])
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// nodes := &nodesByDistance{target: targetHash}
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// for i := 0; i < bucketSize; i++ {
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// nodes.push(nodeAtDistance(test.table.self.sha, i+2), bucketSize)
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// }
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// test.table.stuff(nodes.entries)
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//
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// // ensure there's a bond with the test node,
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// // findnode won't be accepted otherwise.
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// test.table.db.updateNode(NewNode(
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// PubkeyID(&test.remotekey.PublicKey),
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// test.remoteaddr.IP,
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// uint16(test.remoteaddr.Port),
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// 99,
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// ))
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// // check that closest neighbors are returned.
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// test.packetIn(nil, findnodePacket, &findnode{Target: testTarget, Expiration: futureExp})
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// expected := test.table.closest(targetHash, bucketSize)
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//
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// waitNeighbors := func(want []*Node) {
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// test.waitPacketOut(func(p *neighbors) {
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// if len(p.Nodes) != len(want) {
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// t.Errorf("wrong number of results: got %d, want %d", len(p.Nodes), bucketSize)
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// }
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// for i := range p.Nodes {
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// if p.Nodes[i].ID != want[i].ID {
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// t.Errorf("result mismatch at %d:\n got: %v\n want: %v", i, p.Nodes[i], expected.entries[i])
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// }
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// }
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// })
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// }
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// waitNeighbors(expected.entries[:maxNeighbors])
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// waitNeighbors(expected.entries[maxNeighbors:])
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// }
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//
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// func TestUDP_findnodeMultiReply(t *testing.T) {
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// test := newUDPTest(t)
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// defer test.table.Close()
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//
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// // queue a pending findnode request
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// resultc, errc := make(chan []*Node), make(chan error)
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// go func() {
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// rid := PubkeyID(&test.remotekey.PublicKey)
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// ns, err := test.udp.findnode(rid, test.remoteaddr, testTarget)
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// if err != nil && len(ns) == 0 {
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// errc <- err
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// } else {
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// resultc <- ns
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// }
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// }()
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//
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// // wait for the findnode to be sent.
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// // after it is sent, the transport is waiting for a reply
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// test.waitPacketOut(func(p *findnode) {
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// if p.Target != testTarget {
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// t.Errorf("wrong target: got %v, want %v", p.Target, testTarget)
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// }
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// })
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//
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// // send the reply as two packets.
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// list := []*Node{
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// MustParseNode("enode://ba85011c70bcc5c04d8607d3a0ed29aa6179c092cbdda10d5d32684fb33ed01bd94f588ca8f91ac48318087dcb02eaf36773a7a453f0eedd6742af668097b29c@10.0.1.16:30303?discport=30304"),
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// MustParseNode("enode://81fa361d25f157cd421c60dcc28d8dac5ef6a89476633339c5df30287474520caca09627da18543d9079b5b288698b542d56167aa5c09111e55acdbbdf2ef799@10.0.1.16:30303"),
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// MustParseNode("enode://9bffefd833d53fac8e652415f4973bee289e8b1a5c6c4cbe70abf817ce8a64cee11b823b66a987f51aaa9fba0d6a91b3e6bf0d5a5d1042de8e9eeea057b217f8@10.0.1.36:30301?discport=17"),
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// MustParseNode("enode://1b5b4aa662d7cb44a7221bfba67302590b643028197a7d5214790f3bac7aaa4a3241be9e83c09cf1f6c69d007c634faae3dc1b1221793e8446c0b3a09de65960@10.0.1.16:30303"),
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// }
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// rpclist := make([]rpcNode, len(list))
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// for i := range list {
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// rpclist[i] = nodeToRPC(list[i])
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// }
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// test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[:2]})
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// test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[2:]})
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//
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// // check that the sent neighbors are all returned by findnode
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// select {
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// case result := <-resultc:
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// if !reflect.DeepEqual(result, list) {
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// t.Errorf("neighbors mismatch:\n got: %v\n want: %v", result, list)
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// }
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// case err := <-errc:
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// t.Errorf("findnode error: %v", err)
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// case <-time.After(5 * time.Second):
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// t.Error("findnode did not return within 5 seconds")
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// }
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// }
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//
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// func TestUDP_successfulPing(t *testing.T) {
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// test := newUDPTest(t)
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// added := make(chan *Node, 1)
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// test.table.nodeAddedHook = func(n *Node) { added <- n }
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// defer test.table.Close()
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//
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// // The remote side sends a ping packet to initiate the exchange.
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// go test.packetIn(nil, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: Version, Expiration: futureExp})
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//
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// // the ping is replied to.
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// test.waitPacketOut(func(p *pong) {
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// pinghash := test.sent[0][:macSize]
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// if !bytes.Equal(p.ReplyTok, pinghash) {
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// t.Errorf("got pong.ReplyTok %x, want %x", p.ReplyTok, pinghash)
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// }
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// wantTo := rpcEndpoint{
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// // The mirrored UDP address is the UDP packet sender
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// IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
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// // The mirrored TCP port is the one from the ping packet
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// TCP: testRemote.TCP,
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// }
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// if !reflect.DeepEqual(p.To, wantTo) {
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// t.Errorf("got pong.To %v, want %v", p.To, wantTo)
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// }
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// })
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//
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// // remote is unknown, the table pings back.
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// test.waitPacketOut(func(p *ping) error {
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// if !reflect.DeepEqual(p.From, test.udp.ourEndpoint) {
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// t.Errorf("got ping.From %v, want %v", p.From, test.udp.ourEndpoint)
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// }
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// wantTo := rpcEndpoint{
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// // The mirrored UDP address is the UDP packet sender.
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// IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
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// TCP: 0,
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// }
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// if !reflect.DeepEqual(p.To, wantTo) {
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// t.Errorf("got ping.To %v, want %v", p.To, wantTo)
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// }
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// return nil
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// })
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// test.packetIn(nil, pongPacket, &pong{Expiration: futureExp})
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//
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// // the node should be added to the table shortly after getting the
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// // pong packet.
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// select {
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// case n := <-added:
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// rid := PubkeyID(&test.remotekey.PublicKey)
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// if n.ID != rid {
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// t.Errorf("node has wrong ID: got %v, want %v", n.ID, rid)
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// }
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// if !bytes.Equal(n.IP, test.remoteaddr.IP) {
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// t.Errorf("node has wrong IP: got %v, want: %v", n.IP, test.remoteaddr.IP)
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// }
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// if int(n.UDP) != test.remoteaddr.Port {
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// t.Errorf("node has wrong UDP port: got %v, want: %v", n.UDP, test.remoteaddr.Port)
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// }
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// if n.TCP != testRemote.TCP {
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// t.Errorf("node has wrong TCP port: got %v, want: %v", n.TCP, testRemote.TCP)
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// }
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// case <-time.After(2 * time.Second):
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// t.Errorf("node was not added within 2 seconds")
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// }
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// }
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var testPackets = []struct {
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input string
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wantPacket interface{}
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}{
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{
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input: "71dbda3a79554728d4f94411e42ee1f8b0d561c10e1e5f5893367948c6a7d70bb87b235fa28a77070271b6c164a2dce8c7e13a5739b53b5e96f2e5acb0e458a02902f5965d55ecbeb2ebb6cabb8b2b232896a36b737666c55265ad0a68412f250001ea04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a355",
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wantPacket: &ping{
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Version: 4,
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From: rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544},
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To: rpcEndpoint{net.ParseIP("::1"), 2222, 3333},
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Expiration: 1136239445,
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Rest: []rlp.RawValue{},
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},
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},
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{
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input: "e9614ccfd9fc3e74360018522d30e1419a143407ffcce748de3e22116b7e8dc92ff74788c0b6663aaa3d67d641936511c8f8d6ad8698b820a7cf9e1be7155e9a241f556658c55428ec0563514365799a4be2be5a685a80971ddcfa80cb422cdd0101ec04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a3550102",
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wantPacket: &ping{
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Version: 4,
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From: rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544},
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To: rpcEndpoint{net.ParseIP("::1"), 2222, 3333},
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Expiration: 1136239445,
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Rest: []rlp.RawValue{{0x01}, {0x02}},
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},
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},
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{
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input: "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",
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wantPacket: &ping{
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Version: 555,
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From: rpcEndpoint{net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 3322, 5544},
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To: rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338},
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Expiration: 1136239445,
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Rest: []rlp.RawValue{{0xC5, 0x01, 0x02, 0x03, 0x04, 0x05}},
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},
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},
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{
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input: "09b2428d83348d27cdf7064ad9024f526cebc19e4958f0fdad87c15eb598dd61d08423e0bf66b2069869e1724125f820d851c136684082774f870e614d95a2855d000f05d1648b2d5945470bc187c2d2216fbe870f43ed0909009882e176a46b0102f846d79020010db885a308d313198a2e037073488208ae82823aa0fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c9548443b9a355c6010203c2040506a0c969a58f6f9095004c0177a6b47f451530cab38966a25cca5cb58f055542124e",
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wantPacket: &pong{
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To: rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338},
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ReplyTok: common.Hex2Bytes("fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c954"),
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Expiration: 1136239445,
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Rest: []rlp.RawValue{{0xC6, 0x01, 0x02, 0x03, 0xC2, 0x04, 0x05}, {0x06}},
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},
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},
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{
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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
|
|
}
|