mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.1 KiB
87 lines
3.1 KiB
// 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"
|
|
"github.com/holiman/uint256"
|
|
)
|
|
|
|
var (
|
|
// ErrBadProDAOExtra is returned if a header doesn'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:
|
|
//
|
|
// - if the node is no-fork, do not accept blocks in the [fork, fork+10) range
|
|
// with the fork specific extra-data set.
|
|
// - 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 on 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(uint256.Int))
|
|
}
|
|
}
|
|
|