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Merge pull request #1810 from karalabe/pure-header-verifications-2

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core, eth, miner: use pure header validation
This commit is contained in:
Jeffrey Wilcke 2015-09-16 14:21:12 -07:00
commit 58fbcaa750
4 changed files with 26 additions and 28 deletions
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46
core/block_processor.go
View File

@ -214,7 +214,7 @@ func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs st
txs := block.Transactions() txs := block.Transactions()
// Block validation // Block validation
if err = ValidateHeader(sm.Pow, header, parent, false, false); err != nil { if err = ValidateHeader(sm.Pow, header, parent.Header(), false, false); err != nil {
return return
} }
@ -338,7 +338,7 @@ func (sm *BlockProcessor) VerifyUncles(statedb *state.StateDB, block, parent *ty
return UncleError("uncle[%d](%x)'s parent is not ancestor (%x)", i, hash[:4], uncle.ParentHash[0:4]) return UncleError("uncle[%d](%x)'s parent is not ancestor (%x)", i, hash[:4], uncle.ParentHash[0:4])
} }
if err := ValidateHeader(sm.Pow, uncle, ancestors[uncle.ParentHash], true, true); err != nil { if err := ValidateHeader(sm.Pow, uncle, ancestors[uncle.ParentHash].Header(), true, true); err != nil {
return ValidationError(fmt.Sprintf("uncle[%d](%x) header invalid: %v", i, hash[:4], err)) return ValidationError(fmt.Sprintf("uncle[%d](%x) header invalid: %v", i, hash[:4], err))
} }
} }
@ -368,52 +368,50 @@ func (sm *BlockProcessor) GetLogs(block *types.Block) (logs state.Logs, err erro
} }
// See YP section 4.3.4. "Block Header Validity" // See YP section 4.3.4. "Block Header Validity"
// Validates a block. Returns an error if the block is invalid. // Validates a header. Returns an error if the header is invalid.
func ValidateHeader(pow pow.PoW, block *types.Header, parent *types.Block, checkPow, uncle bool) error { func ValidateHeader(pow pow.PoW, header *types.Header, parent *types.Header, checkPow, uncle bool) error {
if big.NewInt(int64(len(block.Extra))).Cmp(params.MaximumExtraDataSize) == 1 { if big.NewInt(int64(len(header.Extra))).Cmp(params.MaximumExtraDataSize) == 1 {
return fmt.Errorf("Block extra data too long (%d)", len(block.Extra)) return fmt.Errorf("Header extra data too long (%d)", len(header.Extra))
} }
if uncle { if uncle {
if block.Time.Cmp(common.MaxBig) == 1 { if header.Time.Cmp(common.MaxBig) == 1 {
return BlockTSTooBigErr return BlockTSTooBigErr
} }
} else { } else {
if block.Time.Cmp(big.NewInt(time.Now().Unix())) == 1 { if header.Time.Cmp(big.NewInt(time.Now().Unix())) == 1 {
return BlockFutureErr return BlockFutureErr
} }
} }
if block.Time.Cmp(parent.Time()) != 1 { if header.Time.Cmp(parent.Time) != 1 {
return BlockEqualTSErr return BlockEqualTSErr
} }
expd := CalcDifficulty(block.Time.Uint64(), parent.Time().Uint64(), parent.Number(), parent.Difficulty()) expd := CalcDifficulty(header.Time.Uint64(), parent.Time.Uint64(), parent.Number, parent.Difficulty)
if expd.Cmp(block.Difficulty) != 0 { if expd.Cmp(header.Difficulty) != 0 {
return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd) return fmt.Errorf("Difficulty check failed for header %v, %v", header.Difficulty, expd)
} }
var a, b *big.Int a := new(big.Int).Set(parent.GasLimit)
a = parent.GasLimit() a = a.Sub(a, header.GasLimit)
a = a.Sub(a, block.GasLimit)
a.Abs(a) a.Abs(a)
b = parent.GasLimit() b := new(big.Int).Set(parent.GasLimit)
b = b.Div(b, params.GasLimitBoundDivisor) b = b.Div(b, params.GasLimitBoundDivisor)
if !(a.Cmp(b) < 0) || (block.GasLimit.Cmp(params.MinGasLimit) == -1) { if !(a.Cmp(b) < 0) || (header.GasLimit.Cmp(params.MinGasLimit) == -1) {
return fmt.Errorf("GasLimit check failed for block %v (%v > %v)", block.GasLimit, a, b) return fmt.Errorf("GasLimit check failed for header %v (%v > %v)", header.GasLimit, a, b)
} }
num := parent.Number() num := new(big.Int).Set(parent.Number)
num.Sub(block.Number, num) num.Sub(header.Number, num)
if num.Cmp(big.NewInt(1)) != 0 { if num.Cmp(big.NewInt(1)) != 0 {
return BlockNumberErr return BlockNumberErr
} }
if checkPow { if checkPow {
// Verify the nonce of the block. Return an error if it's not valid // Verify the nonce of the header. Return an error if it's not valid
if !pow.Verify(types.NewBlockWithHeader(block)) { if !pow.Verify(types.NewBlockWithHeader(header)) {
return ValidationError("Block's nonce is invalid (= %x)", block.Nonce) return ValidationError("Header's nonce is invalid (= %x)", header.Nonce)
} }
} }
return nil return nil
} }

4
core/block_processor_test.go
View File

@ -48,13 +48,13 @@ func TestNumber(t *testing.T) {
statedb := state.New(chain.Genesis().Root(), chain.chainDb) statedb := state.New(chain.Genesis().Root(), chain.chainDb)
header := makeHeader(chain.Genesis(), statedb) header := makeHeader(chain.Genesis(), statedb)
header.Number = big.NewInt(3) header.Number = big.NewInt(3)
err := ValidateHeader(pow, header, chain.Genesis(), false, false) err := ValidateHeader(pow, header, chain.Genesis().Header(), false, false)
if err != BlockNumberErr { if err != BlockNumberErr {
t.Errorf("expected block number error, got %q", err) t.Errorf("expected block number error, got %q", err)
} }
header = makeHeader(chain.Genesis(), statedb) header = makeHeader(chain.Genesis(), statedb)
err = ValidateHeader(pow, header, chain.Genesis(), false, false) err = ValidateHeader(pow, header, chain.Genesis().Header(), false, false)
if err == BlockNumberErr { if err == BlockNumberErr {
t.Errorf("didn't expect block number error") t.Errorf("didn't expect block number error")
} }

2
eth/handler.go
View File

@ -119,7 +119,7 @@ func NewProtocolManager(networkId int, mux *event.TypeMux, txpool txPool, pow po
manager.downloader = downloader.New(manager.eventMux, manager.chainman.HasBlock, manager.chainman.GetBlock, manager.chainman.CurrentBlock, manager.chainman.GetTd, manager.chainman.InsertChain, manager.removePeer) manager.downloader = downloader.New(manager.eventMux, manager.chainman.HasBlock, manager.chainman.GetBlock, manager.chainman.CurrentBlock, manager.chainman.GetTd, manager.chainman.InsertChain, manager.removePeer)
validator := func(block *types.Block, parent *types.Block) error { validator := func(block *types.Block, parent *types.Block) error {
return core.ValidateHeader(pow, block.Header(), parent, true, false) return core.ValidateHeader(pow, block.Header(), parent.Header(), true, false)
} }
heighter := func() uint64 { heighter := func() uint64 {
return manager.chainman.CurrentBlock().NumberU64() return manager.chainman.CurrentBlock().NumberU64()

2
miner/worker.go
View File

@ -279,7 +279,7 @@ func (self *worker) wait() {
glog.V(logger.Error).Infoln("Invalid block found during mining") glog.V(logger.Error).Infoln("Invalid block found during mining")
continue continue
} }
if err := core.ValidateHeader(self.eth.BlockProcessor().Pow, block.Header(), parent, true, false); err != nil && err != core.BlockFutureErr { if err := core.ValidateHeader(self.eth.BlockProcessor().Pow, block.Header(), parent.Header(), true, false); err != nil && err != core.BlockFutureErr {
glog.V(logger.Error).Infoln("Invalid header on mined block:", err) glog.V(logger.Error).Infoln("Invalid header on mined block:", err)
continue continue
} }