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-rw-r--r--consensus/misc/dao.go85
1 files changed, 85 insertions, 0 deletions
diff --git a/consensus/misc/dao.go b/consensus/misc/dao.go
new file mode 100644
index 000000000..67d4adb44
--- /dev/null
+++ b/consensus/misc/dao.go
@@ -0,0 +1,85 @@
+// Copyright 2016 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 misc
+
+import (
+ "bytes"
+ "errors"
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/core/state"
+ "github.com/ethereum/go-ethereum/core/types"
+ "github.com/ethereum/go-ethereum/params"
+)
+
+var (
+ // ErrBadProDAOExtra is returned if a header doens't support the DAO fork on a
+ // pro-fork client.
+ ErrBadProDAOExtra = errors.New("bad DAO pro-fork extra-data")
+
+ // ErrBadNoDAOExtra is returned if a header does support the DAO fork on a no-
+ // fork client.
+ ErrBadNoDAOExtra = errors.New("bad DAO no-fork extra-data")
+)
+
+// VerifyDAOHeaderExtraData validates the extra-data field of a block header to
+// ensure it conforms to DAO hard-fork rules.
+//
+// DAO hard-fork extension to the header validity:
+// a) if the node is no-fork, do not accept blocks in the [fork, fork+10) range
+// with the fork specific extra-data set
+// b) if the node is pro-fork, require blocks in the specific range to have the
+// unique extra-data set.
+func VerifyDAOHeaderExtraData(config *params.ChainConfig, header *types.Header) error {
+ // Short circuit validation if the node doesn't care about the DAO fork
+ if config.DAOForkBlock == nil {
+ return nil
+ }
+ // Make sure the block is within the fork's modified extra-data range
+ limit := new(big.Int).Add(config.DAOForkBlock, params.DAOForkExtraRange)
+ if header.Number.Cmp(config.DAOForkBlock) < 0 || header.Number.Cmp(limit) >= 0 {
+ return nil
+ }
+ // Depending whether we support or oppose the fork, validate the extra-data contents
+ if config.DAOForkSupport {
+ if !bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
+ return ErrBadProDAOExtra
+ }
+ } else {
+ if bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
+ return ErrBadNoDAOExtra
+ }
+ }
+ // All ok, header has the same extra-data we expect
+ return nil
+}
+
+// ApplyDAOHardFork modifies the state database according to the DAO hard-fork
+// rules, transferring all balances of a set of DAO accounts to a single refund
+// contract.
+func ApplyDAOHardFork(statedb *state.StateDB) {
+ // Retrieve the contract to refund balances into
+ if !statedb.Exist(params.DAORefundContract) {
+ statedb.CreateAccount(params.DAORefundContract)
+ }
+
+ // Move every DAO account and extra-balance account funds into the refund contract
+ for _, addr := range params.DAODrainList() {
+ statedb.AddBalance(params.DAORefundContract, statedb.GetBalance(addr))
+ statedb.SetBalance(addr, new(big.Int))
+ }
+}