Official Go implementation of the Ethereum protocol
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go-ethereum/tests/fuzzers/les/les-fuzzer.go

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// Copyright 2021 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 les
import (
"bytes"
"encoding/binary"
"io"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
l "github.com/ethereum/go-ethereum/les"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
)
var (
bankKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
bankAddr = crypto.PubkeyToAddress(bankKey.PublicKey)
bankFunds = new(big.Int).Mul(big.NewInt(100), big.NewInt(params.Ether))
testChainLen = 256
testContractCode = common.Hex2Bytes("606060405260cc8060106000396000f360606040526000357c01000000000000000000000000000000000000000000000000000000009004806360cd2685146041578063c16431b914606b57603f565b005b6055600480803590602001909190505060a9565b6040518082815260200191505060405180910390f35b60886004808035906020019091908035906020019091905050608a565b005b80600060005083606481101560025790900160005b50819055505b5050565b6000600060005082606481101560025790900160005b5054905060c7565b91905056")
chain *core.BlockChain
addrHashes []common.Hash
txHashes []common.Hash
chtTrie *trie.Trie
bloomTrie *trie.Trie
chtKeys [][]byte
bloomKeys [][]byte
)
func makechain() (bc *core.BlockChain, addrHashes, txHashes []common.Hash) {
db := rawdb.NewMemoryDatabase()
gspec := core.Genesis{
Config: params.TestChainConfig,
Alloc: core.GenesisAlloc{bankAddr: {Balance: bankFunds}},
GasLimit: 100000000,
}
genesis := gspec.MustCommit(db)
signer := types.HomesteadSigner{}
blocks, _ := core.GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, testChainLen,
func(i int, gen *core.BlockGen) {
var (
tx *types.Transaction
addr common.Address
)
nonce := uint64(i)
if i%4 == 0 {
tx, _ = types.SignTx(types.NewContractCreation(nonce, big.NewInt(0), 200000, big.NewInt(0), testContractCode), signer, bankKey)
addr = crypto.CreateAddress(bankAddr, nonce)
} else {
addr = common.BigToAddress(big.NewInt(int64(i)))
tx, _ = types.SignTx(types.NewTransaction(nonce, addr, big.NewInt(10000), params.TxGas, big.NewInt(params.GWei), nil), signer, bankKey)
}
gen.AddTx(tx)
addrHashes = append(addrHashes, crypto.Keccak256Hash(addr[:]))
txHashes = append(txHashes, tx.Hash())
})
bc, _ = core.NewBlockChain(db, nil, gspec.Config, ethash.NewFaker(), vm.Config{}, nil, nil)
if _, err := bc.InsertChain(blocks); err != nil {
panic(err)
}
return
}
func makeTries() (chtTrie *trie.Trie, bloomTrie *trie.Trie, chtKeys, bloomKeys [][]byte) {
chtTrie = trie.NewEmpty(trie.NewDatabase(rawdb.NewMemoryDatabase()))
bloomTrie = trie.NewEmpty(trie.NewDatabase(rawdb.NewMemoryDatabase()))
for i := 0; i < testChainLen; i++ {
// The element in CHT is <big-endian block number> -> <block hash>
key := make([]byte, 8)
binary.BigEndian.PutUint64(key, uint64(i+1))
chtTrie.Update(key, []byte{0x1, 0xf})
chtKeys = append(chtKeys, key)
// The element in Bloom trie is <2 byte bit index> + <big-endian block number> -> bloom
key2 := make([]byte, 10)
binary.BigEndian.PutUint64(key2[2:], uint64(i+1))
bloomTrie.Update(key2, []byte{0x2, 0xe})
bloomKeys = append(bloomKeys, key2)
}
return
}
func init() {
chain, addrHashes, txHashes = makechain()
chtTrie, bloomTrie, chtKeys, bloomKeys = makeTries()
}
type fuzzer struct {
chain *core.BlockChain
pool *core.TxPool
chainLen int
addr, txs []common.Hash
nonce uint64
chtKeys [][]byte
bloomKeys [][]byte
chtTrie *trie.Trie
bloomTrie *trie.Trie
input io.Reader
exhausted bool
}
func newFuzzer(input []byte) *fuzzer {
return &fuzzer{
chain: chain,
chainLen: testChainLen,
addr: addrHashes,
txs: txHashes,
chtTrie: chtTrie,
bloomTrie: bloomTrie,
chtKeys: chtKeys,
bloomKeys: bloomKeys,
nonce: uint64(len(txHashes)),
pool: core.NewTxPool(core.DefaultTxPoolConfig, params.TestChainConfig, chain),
input: bytes.NewReader(input),
}
}
func (f *fuzzer) read(size int) []byte {
out := make([]byte, size)
if _, err := f.input.Read(out); err != nil {
f.exhausted = true
}
return out
}
func (f *fuzzer) randomByte() byte {
d := f.read(1)
return d[0]
}
func (f *fuzzer) randomBool() bool {
d := f.read(1)
return d[0]&1 == 1
}
func (f *fuzzer) randomInt(max int) int {
if max == 0 {
return 0
}
if max <= 256 {
return int(f.randomByte()) % max
}
var a uint16
if err := binary.Read(f.input, binary.LittleEndian, &a); err != nil {
f.exhausted = true
}
return int(a % uint16(max))
}
func (f *fuzzer) randomX(max int) uint64 {
var a uint16
if err := binary.Read(f.input, binary.LittleEndian, &a); err != nil {
f.exhausted = true
}
if a < 0x8000 {
return uint64(a%uint16(max+1)) - 1
}
return (uint64(1)<<(a%64+1) - 1) & (uint64(a) * 343897772345826595)
}
func (f *fuzzer) randomBlockHash() common.Hash {
h := f.chain.GetCanonicalHash(uint64(f.randomInt(3 * f.chainLen)))
if h != (common.Hash{}) {
return h
}
return common.BytesToHash(f.read(common.HashLength))
}
func (f *fuzzer) randomAddrHash() []byte {
i := f.randomInt(3 * len(f.addr))
if i < len(f.addr) {
return f.addr[i].Bytes()
}
return f.read(common.HashLength)
}
func (f *fuzzer) randomCHTTrieKey() []byte {
i := f.randomInt(3 * len(f.chtKeys))
if i < len(f.chtKeys) {
return f.chtKeys[i]
}
return f.read(8)
}
func (f *fuzzer) randomBloomTrieKey() []byte {
i := f.randomInt(3 * len(f.bloomKeys))
if i < len(f.bloomKeys) {
return f.bloomKeys[i]
}
return f.read(10)
}
func (f *fuzzer) randomTxHash() common.Hash {
i := f.randomInt(3 * len(f.txs))
if i < len(f.txs) {
return f.txs[i]
}
return common.BytesToHash(f.read(common.HashLength))
}
func (f *fuzzer) BlockChain() *core.BlockChain {
return f.chain
}
func (f *fuzzer) TxPool() *core.TxPool {
return f.pool
}
func (f *fuzzer) ArchiveMode() bool {
return false
}
func (f *fuzzer) AddTxsSync() bool {
return false
}
func (f *fuzzer) GetHelperTrie(typ uint, index uint64) *trie.Trie {
if typ == 0 {
return f.chtTrie
} else if typ == 1 {
return f.bloomTrie
}
return nil
}
type dummyMsg struct {
data []byte
}
func (d dummyMsg) Decode(val interface{}) error {
return rlp.DecodeBytes(d.data, val)
}
func (f *fuzzer) doFuzz(msgCode uint64, packet interface{}) {
enc, err := rlp.EncodeToBytes(packet)
if err != nil {
panic(err)
}
version := f.randomInt(3) + 2 // [LES2, LES3, LES4]
peer, closeFn := l.NewFuzzerPeer(version)
defer closeFn()
fn, _, _, err := l.Les3[msgCode].Handle(dummyMsg{enc})
if err != nil {
panic(err)
}
fn(f, peer, func() bool { return true })
}
func Fuzz(input []byte) int {
// We expect some large inputs
if len(input) < 100 {
return -1
}
f := newFuzzer(input)
if f.exhausted {
return -1
}
for !f.exhausted {
switch f.randomInt(8) {
case 0:
req := &l.GetBlockHeadersPacket{
Query: l.GetBlockHeadersData{
Amount: f.randomX(l.MaxHeaderFetch + 1),
Skip: f.randomX(10),
Reverse: f.randomBool(),
},
}
if f.randomBool() {
req.Query.Origin.Hash = f.randomBlockHash()
} else {
req.Query.Origin.Number = uint64(f.randomInt(f.chainLen * 2))
}
f.doFuzz(l.GetBlockHeadersMsg, req)
case 1:
req := &l.GetBlockBodiesPacket{Hashes: make([]common.Hash, f.randomInt(l.MaxBodyFetch+1))}
for i := range req.Hashes {
req.Hashes[i] = f.randomBlockHash()
}
f.doFuzz(l.GetBlockBodiesMsg, req)
case 2:
req := &l.GetCodePacket{Reqs: make([]l.CodeReq, f.randomInt(l.MaxCodeFetch+1))}
for i := range req.Reqs {
req.Reqs[i] = l.CodeReq{
BHash: f.randomBlockHash(),
AccKey: f.randomAddrHash(),
}
}
f.doFuzz(l.GetCodeMsg, req)
case 3:
req := &l.GetReceiptsPacket{Hashes: make([]common.Hash, f.randomInt(l.MaxReceiptFetch+1))}
for i := range req.Hashes {
req.Hashes[i] = f.randomBlockHash()
}
f.doFuzz(l.GetReceiptsMsg, req)
case 4:
req := &l.GetProofsPacket{Reqs: make([]l.ProofReq, f.randomInt(l.MaxProofsFetch+1))}
for i := range req.Reqs {
if f.randomBool() {
req.Reqs[i] = l.ProofReq{
BHash: f.randomBlockHash(),
AccKey: f.randomAddrHash(),
Key: f.randomAddrHash(),
FromLevel: uint(f.randomX(3)),
}
} else {
req.Reqs[i] = l.ProofReq{
BHash: f.randomBlockHash(),
Key: f.randomAddrHash(),
FromLevel: uint(f.randomX(3)),
}
}
}
f.doFuzz(l.GetProofsV2Msg, req)
case 5:
req := &l.GetHelperTrieProofsPacket{Reqs: make([]l.HelperTrieReq, f.randomInt(l.MaxHelperTrieProofsFetch+1))}
for i := range req.Reqs {
switch f.randomInt(3) {
case 0:
// Canonical hash trie
req.Reqs[i] = l.HelperTrieReq{
Type: 0,
TrieIdx: f.randomX(3),
Key: f.randomCHTTrieKey(),
FromLevel: uint(f.randomX(3)),
AuxReq: uint(2),
}
case 1:
// Bloom trie
req.Reqs[i] = l.HelperTrieReq{
Type: 1,
TrieIdx: f.randomX(3),
Key: f.randomBloomTrieKey(),
FromLevel: uint(f.randomX(3)),
AuxReq: 0,
}
default:
// Random trie
req.Reqs[i] = l.HelperTrieReq{
Type: 2,
TrieIdx: f.randomX(3),
Key: f.randomCHTTrieKey(),
FromLevel: uint(f.randomX(3)),
AuxReq: 0,
}
}
}
f.doFuzz(l.GetHelperTrieProofsMsg, req)
case 6:
req := &l.SendTxPacket{Txs: make([]*types.Transaction, f.randomInt(l.MaxTxSend+1))}
signer := types.HomesteadSigner{}
for i := range req.Txs {
var nonce uint64
if f.randomBool() {
nonce = uint64(f.randomByte())
} else {
nonce = f.nonce
f.nonce += 1
}
req.Txs[i], _ = types.SignTx(types.NewTransaction(nonce, common.Address{}, big.NewInt(10000), params.TxGas, big.NewInt(1000000000*int64(f.randomByte())), nil), signer, bankKey)
}
f.doFuzz(l.SendTxV2Msg, req)
case 7:
req := &l.GetTxStatusPacket{Hashes: make([]common.Hash, f.randomInt(l.MaxTxStatus+1))}
for i := range req.Hashes {
req.Hashes[i] = f.randomTxHash()
}
f.doFuzz(l.GetTxStatusMsg, req)
}
}
return 0
}