86 lines
3.1 KiB
Go
86 lines
3.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package misc
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import (
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"bytes"
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"errors"
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"math/big"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/params"
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)
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var (
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// ErrBadProDAOExtra is returned if a header doens't support the DAO fork on a
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// pro-fork client.
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ErrBadProDAOExtra = errors.New("bad DAO pro-fork extra-data")
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// ErrBadNoDAOExtra is returned if a header does support the DAO fork on a no-
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// fork client.
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ErrBadNoDAOExtra = errors.New("bad DAO no-fork extra-data")
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)
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// VerifyDAOHeaderExtraData validates the extra-data field of a block header to
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// ensure it conforms to DAO hard-fork rules.
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//
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// DAO hard-fork extension to the header validity:
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// a) if the node is no-fork, do not accept blocks in the [fork, fork+10) range
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// with the fork specific extra-data set
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// b) if the node is pro-fork, require blocks in the specific range to have the
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// unique extra-data set.
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func VerifyDAOHeaderExtraData(config *params.ChainConfig, header *types.Header) error {
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// Short circuit validation if the node doesn't care about the DAO fork
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if config.DAOForkBlock == nil {
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return nil
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}
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// Make sure the block is within the fork's modified extra-data range
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limit := new(big.Int).Add(config.DAOForkBlock, params.DAOForkExtraRange)
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if header.Number.Cmp(config.DAOForkBlock) < 0 || header.Number.Cmp(limit) >= 0 {
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return nil
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}
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// Depending whether we support or oppose the fork, validate the extra-data contents
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if config.DAOForkSupport {
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if !bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
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return ErrBadProDAOExtra
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}
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} else {
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if bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
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return ErrBadNoDAOExtra
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}
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}
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// All ok, header has the same extra-data we expect
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return nil
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}
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// ApplyDAOHardFork modifies the state database according to the DAO hard-fork
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// rules, transferring all balances of a set of DAO accounts to a single refund
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// contract.
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func ApplyDAOHardFork(statedb *state.StateDB) {
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// Retrieve the contract to refund balances into
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if !statedb.Exist(params.DAORefundContract) {
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statedb.CreateAccount(params.DAORefundContract)
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}
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// Move every DAO account and extra-balance account funds into the refund contract
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for _, addr := range params.DAODrainList() {
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statedb.AddBalance(params.DAORefundContract, statedb.GetBalance(addr))
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statedb.SetBalance(addr, new(big.Int))
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}
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}
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