consensus/clique: add fork hash enforcement (#15236)

Author: karalabe

consensus/clique/clique.go

@@ -29,6 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/consensus"
+	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -313,6 +314,10 @@ func (c *Clique) verifyHeader(chain consensus.ChainReader, header *types.Header,
 			return errInvalidDifficulty
 		}
 	}
+	// If all checks passed, validate any special fields for hard forks
+	if err := misc.VerifyForkHashes(chain.Config(), header, false); err != nil {
+		return err
+	}
 	// All basic checks passed, verify cascading fields
 	return c.verifyCascadingFields(chain, header, parents)
 }

consensus/clique/snapshot_test.go

@@ -74,7 +74,7 @@ type testerChainReader struct {
 	db ethdb.Database
 }
 
-func (r *testerChainReader) Config() *params.ChainConfig                 { panic("not supported") }
+func (r *testerChainReader) Config() *params.ChainConfig                 { return params.AllProtocolChanges }
 func (r *testerChainReader) CurrentHeader() *types.Header                { panic("not supported") }
 func (r *testerChainReader) GetHeader(common.Hash, uint64) *types.Header { panic("not supported") }
 func (r *testerChainReader) GetBlock(common.Hash, uint64) *types.Block   { panic("not supported") }