core/forkid: correctly compute forkid when timestamp fork is activated in genesis (#27895)

This changes the forkID calculation to ignore time-based forks that occurred before the
genesis block. It's supposed to be done this way because the spec says:

> If a chain is configured to start with a non-Frontier ruleset already in its genesis, that is NOT considered a fork.

cmd/devp2p/internal/ethtest/chain.go

@@ -77,7 +77,7 @@ func (c *Chain) RootAt(height int) common.Hash {
 
 // ForkID gets the fork id of the chain.
 func (c *Chain) ForkID() forkid.ID {
-	return forkid.NewID(c.chainConfig, c.blocks[0].Hash(), uint64(c.Len()), c.blocks[0].Time())
+	return forkid.NewID(c.chainConfig, c.blocks[0], uint64(c.Len()), c.blocks[0].Time())
 }
 
 // Shorten returns a copy chain of a desired height from the imported

core/forkid/forkid.go

@@ -73,9 +73,9 @@ type ID struct {
 type Filter func(id ID) error
 
 // NewID calculates the Ethereum fork ID from the chain config, genesis hash, head and time.
-func NewID(config *params.ChainConfig, genesis common.Hash, head, time uint64) ID {
+func NewID(config *params.ChainConfig, genesis *types.Block, head, time uint64) ID {
 	// Calculate the starting checksum from the genesis hash
-	hash := crc32.ChecksumIEEE(genesis[:])
+	hash := crc32.ChecksumIEEE(genesis.Hash().Bytes())
 
 	// Calculate the current fork checksum and the next fork block
 	forksByBlock, forksByTime := gatherForks(config)
@@ -88,6 +88,10 @@ func NewID(config *params.ChainConfig, genesis common.Hash, head, time uint64) I
 		return ID{Hash: checksumToBytes(hash), Next: fork}
 	}
 	for _, fork := range forksByTime {
+		if fork <= genesis.Time() {
+			// Fork active in genesis, skip in forkid calculation
+			continue
+		}
 		if fork <= time {
 			// Fork already passed, checksum the previous hash and fork timestamp
 			hash = checksumUpdate(hash, fork)
@@ -104,7 +108,7 @@ func NewIDWithChain(chain Blockchain) ID {
 
 	return NewID(
 		chain.Config(),
-		chain.Genesis().Hash(),
+		chain.Genesis(),
 		head.Number.Uint64(),
 		head.Time,
 	)

core/forkid/forkid_test.go

@@ -18,10 +18,14 @@ package forkid
 
 import (
 	"bytes"
+	"hash/crc32"
 	"math"
+	"math/big"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 )
@@ -36,13 +40,13 @@ func TestCreation(t *testing.T) {
 	}
 	tests := []struct {
 		config  *params.ChainConfig
-		genesis common.Hash
+		genesis *types.Block
 		cases   []testcase
 	}{
 		// Mainnet test cases
 		{
 			params.MainnetChainConfig,
-			params.MainnetGenesisHash,
+			core.DefaultGenesisBlock().ToBlock(),
 			[]testcase{
 				{0, 0, ID{Hash: checksumToBytes(0xfc64ec04), Next: 1150000}},                    // Unsynced
 				{1149999, 0, ID{Hash: checksumToBytes(0xfc64ec04), Next: 1150000}},              // Last Frontier block
@@ -77,7 +81,7 @@ func TestCreation(t *testing.T) {
 		// Goerli test cases
 		{
 			params.GoerliChainConfig,
-			params.GoerliGenesisHash,
+			core.DefaultGoerliGenesisBlock().ToBlock(),
 			[]testcase{
 				{0, 0, ID{Hash: checksumToBytes(0xa3f5ab08), Next: 1561651}},                   // Unsynced, last Frontier, Homestead, Tangerine, Spurious, Byzantium, Constantinople and first Petersburg block
 				{1561650, 0, ID{Hash: checksumToBytes(0xa3f5ab08), Next: 1561651}},             // Last Petersburg block
@@ -94,7 +98,7 @@ func TestCreation(t *testing.T) {
 		// Sepolia test cases
 		{
 			params.SepoliaChainConfig,
-			params.SepoliaGenesisHash,
+			core.DefaultSepoliaGenesisBlock().ToBlock(),
 			[]testcase{
 				{0, 0, ID{Hash: checksumToBytes(0xfe3366e7), Next: 1735371}},                   // Unsynced, last Frontier, Homestead, Tangerine, Spurious, Byzantium, Constantinople, Petersburg, Istanbul, Berlin and first London block
 				{1735370, 0, ID{Hash: checksumToBytes(0xfe3366e7), Next: 1735371}},             // Last London block
@@ -382,3 +386,55 @@ func TestEncoding(t *testing.T) {
 		}
 	}
 }
+
+// Tests that time-based forks which are active at genesis are not included in
+// forkid hash.
+func TestTimeBasedForkInGenesis(t *testing.T) {
+	var (
+		time       = uint64(1690475657)
+		genesis    = types.NewBlockWithHeader(&types.Header{Time: time})
+		forkidHash = checksumToBytes(crc32.ChecksumIEEE(genesis.Hash().Bytes()))
+		config     = func(shanghai, cancun uint64) *params.ChainConfig {
+			return &params.ChainConfig{
+				ChainID:                       big.NewInt(1337),
+				HomesteadBlock:                big.NewInt(0),
+				DAOForkBlock:                  nil,
+				DAOForkSupport:                true,
+				EIP150Block:                   big.NewInt(0),
+				EIP155Block:                   big.NewInt(0),
+				EIP158Block:                   big.NewInt(0),
+				ByzantiumBlock:                big.NewInt(0),
+				ConstantinopleBlock:           big.NewInt(0),
+				PetersburgBlock:               big.NewInt(0),
+				IstanbulBlock:                 big.NewInt(0),
+				MuirGlacierBlock:              big.NewInt(0),
+				BerlinBlock:                   big.NewInt(0),
+				LondonBlock:                   big.NewInt(0),
+				TerminalTotalDifficulty:       big.NewInt(0),
+				TerminalTotalDifficultyPassed: true,
+				MergeNetsplitBlock:            big.NewInt(0),
+				ShanghaiTime:                  &shanghai,
+				CancunTime:                    &cancun,
+				Ethash:                        new(params.EthashConfig),
+			}
+		}
+	)
+	tests := []struct {
+		config *params.ChainConfig
+		want   ID
+	}{
+		// Shanghai active before genesis, skip
+		{config(time-1, time+1), ID{Hash: forkidHash, Next: time + 1}},
+
+		// Shanghai active at genesis, skip
+		{config(time, time+1), ID{Hash: forkidHash, Next: time + 1}},
+
+		// Shanghai not active, skip
+		{config(time+1, time+2), ID{Hash: forkidHash, Next: time + 1}},
+	}
+	for _, tt := range tests {
+		if have := NewID(tt.config, genesis, 0, time); have != tt.want {
+			t.Fatalf("incorrect forkid hash: have %x, want %x", have, tt.want)
+		}
+	}
+}

eth/handler.go

@@ -355,7 +355,7 @@ func (h *handler) runEthPeer(peer *eth.Peer, handler eth.Handler) error {
 		number  = head.Number.Uint64()
 		td      = h.chain.GetTd(hash, number)
 	)
-	forkID := forkid.NewID(h.chain.Config(), genesis.Hash(), number, head.Time)
+	forkID := forkid.NewID(h.chain.Config(), genesis, number, head.Time)
 	if err := peer.Handshake(h.networkID, td, hash, genesis.Hash(), forkID, h.forkFilter); err != nil {
 		peer.Log().Debug("Ethereum handshake failed", "err", err)
 		return err

eth/protocols/eth/discovery.go

@@ -61,6 +61,6 @@ func StartENRUpdater(chain *core.BlockChain, ln *enode.LocalNode) {
 func currentENREntry(chain *core.BlockChain) *enrEntry {
 	head := chain.CurrentHeader()
 	return &enrEntry{
-		ForkID: forkid.NewID(chain.Config(), chain.Genesis().Hash(), head.Number.Uint64(), head.Time),
+		ForkID: forkid.NewID(chain.Config(), chain.Genesis(), head.Number.Uint64(), head.Time),
 	}
 }

eth/protocols/eth/handshake_test.go

@@ -40,7 +40,7 @@ func testHandshake(t *testing.T, protocol uint) {
 		genesis = backend.chain.Genesis()
 		head    = backend.chain.CurrentBlock()
 		td      = backend.chain.GetTd(head.Hash(), head.Number.Uint64())
-		forkID  = forkid.NewID(backend.chain.Config(), backend.chain.Genesis().Hash(), backend.chain.CurrentHeader().Number.Uint64(), backend.chain.CurrentHeader().Time)
+		forkID  = forkid.NewID(backend.chain.Config(), backend.chain.Genesis(), backend.chain.CurrentHeader().Number.Uint64(), backend.chain.CurrentHeader().Time)
 	)
 	tests := []struct {
 		code uint64

les/client_handler.go

@@ -69,7 +69,7 @@ func (h *clientHandler) handle(p *serverPeer, noInitAnnounce bool) error {
 	p.Log().Debug("Light Ethereum peer connected", "name", p.Name())
 
 	// Execute the LES handshake
-	forkid := forkid.NewID(h.backend.blockchain.Config(), h.backend.genesis, h.backend.blockchain.CurrentHeader().Number.Uint64(), h.backend.blockchain.CurrentHeader().Time)
+	forkid := forkid.NewID(h.backend.blockchain.Config(), h.backend.BlockChain().Genesis(), h.backend.blockchain.CurrentHeader().Number.Uint64(), h.backend.blockchain.CurrentHeader().Time)
 	if err := p.Handshake(h.backend.blockchain.Genesis().Hash(), forkid, h.forkFilter); err != nil {
 		p.Log().Debug("Light Ethereum handshake failed", "err", err)
 		return err

les/peer_test.go

@@ -124,8 +124,8 @@ func TestHandshake(t *testing.T) {
 		genesis = common.HexToHash("cafebabe")
 
 		chain1, chain2   = &fakeChain{}, &fakeChain{}
-		forkID1          = forkid.NewID(chain1.Config(), chain1.Genesis().Hash(), chain1.CurrentHeader().Number.Uint64(), chain1.CurrentHeader().Time)
-		forkID2          = forkid.NewID(chain2.Config(), chain2.Genesis().Hash(), chain2.CurrentHeader().Number.Uint64(), chain2.CurrentHeader().Time)
+		forkID1          = forkid.NewID(chain1.Config(), chain1.Genesis(), chain1.CurrentHeader().Number.Uint64(), chain1.CurrentHeader().Time)
+		forkID2          = forkid.NewID(chain2.Config(), chain2.Genesis(), chain2.CurrentHeader().Number.Uint64(), chain2.CurrentHeader().Time)
 		filter1, filter2 = forkid.NewFilter(chain1), forkid.NewFilter(chain2)
 	)
 

les/server_handler.go

@@ -116,7 +116,7 @@ func (h *serverHandler) handle(p *clientPeer) error {
 		hash   = head.Hash()
 		number = head.Number.Uint64()
 		td     = h.blockchain.GetTd(hash, number)
-		forkID = forkid.NewID(h.blockchain.Config(), h.blockchain.Genesis().Hash(), number, head.Time)
+		forkID = forkid.NewID(h.blockchain.Config(), h.blockchain.Genesis(), number, head.Time)
 	)
 	if err := p.Handshake(td, hash, number, h.blockchain.Genesis().Hash(), forkID, h.forkFilter, h.server); err != nil {
 		p.Log().Debug("Light Ethereum handshake failed", "err", err)

les/test_helper.go

@@ -499,7 +499,7 @@ func (server *testServer) newRawPeer(t *testing.T, name string, version int) (*t
 		head    = server.handler.blockchain.CurrentHeader()
 		td      = server.handler.blockchain.GetTd(head.Hash(), head.Number.Uint64())
 	)
-	forkID := forkid.NewID(server.handler.blockchain.Config(), genesis.Hash(), head.Number.Uint64(), head.Time)
+	forkID := forkid.NewID(server.handler.blockchain.Config(), genesis, head.Number.Uint64(), head.Time)
 	tp.handshakeWithServer(t, td, head.Hash(), head.Number.Uint64(), genesis.Hash(), forkID)
 
 	// Ensure the connection is established or exits when any error occurs