cmd, core, miner: add extradata validation to consensus rules

1 files changed, 8 insertions, 2 deletions

diff --git a/miner/worker.go b/miner/worker.go
index 7197a33ba..ba0085d52 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -17,6 +17,7 @@
 package miner
 
 import (
+	"bytes"
 	"fmt"
 	"math/big"
 	"sync"
@@ -469,12 +470,17 @@ func (self *worker) commitNewWork() {
 		Extra:      self.extra,
 		Time:       big.NewInt(tstamp),
 	}
-	// If we are doing a DAO hard-fork check whether to override the extra-data or not
+	// If we are care about TheDAO hard-fork check whether to override the extra-data or not
 	if daoBlock := self.config.DAOForkBlock; daoBlock != nil {
 		// Check whether the block is among the fork extra-override range
 		limit := new(big.Int).Add(daoBlock, params.DAOForkExtraRange)
 		if daoBlock.Cmp(header.Number) <= 0 && header.Number.Cmp(limit) < 0 {
-			header.Extra = common.CopyBytes(params.DAOForkBlockExtra)
+			// Depending whether we support or oppose the fork, override differently
+			if self.config.DAOForkSupport {
+				header.Extra = common.CopyBytes(params.DAOForkBlockExtra)
+			} else if bytes.Compare(header.Extra, params.DAOForkBlockExtra) == 0 {
+				header.Extra = []byte{} // If miner opposes, don't let it use the reserved extra-data
+			}
 		}
 	}
 	previous := self.current