685d44dbc1
Invoke `_initialize` method on every call if present. In NEO3 there is no entrypoint and methods are invoked by offset, thus `Main` function is no longer required. We still have special `Main` method in tests to simplify them.
611 lines
18 KiB
Go
611 lines
18 KiB
Go
package core
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import (
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"crypto/elliptic"
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"errors"
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"fmt"
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"math"
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"math/big"
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"strings"
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"unicode/utf8"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"go.uber.org/zap"
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)
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const (
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// MaxStorageKeyLen is the maximum length of a key for storage items.
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MaxStorageKeyLen = 64
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// MaxStorageValueLen is the maximum length of a value for storage items.
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// It is set to be the maximum value for uint16.
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MaxStorageValueLen = 65535
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// MaxTraceableBlocks is the maximum number of blocks before current chain
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// height we're able to give information about.
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MaxTraceableBlocks = transaction.MaxValidUntilBlockIncrement
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// MaxEventNameLen is the maximum length of a name for event.
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MaxEventNameLen = 32
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// MaxNotificationSize is the maximum length of a runtime log message.
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MaxNotificationSize = 1024
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)
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// StorageContext contains storing id and read/write flag, it's used as
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// a context for storage manipulation functions.
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type StorageContext struct {
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ID int32
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ReadOnly bool
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}
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// StorageFlag represents storage flag which denotes whether the stored value is
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// a constant.
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type StorageFlag byte
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const (
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// None is a storage flag for non-constant items.
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None StorageFlag = 0
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// Constant is a storage flag for constant items.
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Constant StorageFlag = 0x01
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)
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// getBlockHashFromElement converts given vm.Element to block hash using given
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// Blockchainer if needed. Interop functions accept both block numbers and
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// block hashes as parameters, thus this function is needed.
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func getBlockHashFromElement(bc blockchainer.Blockchainer, element *vm.Element) (util.Uint256, error) {
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var hash util.Uint256
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hashbytes := element.Bytes()
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if len(hashbytes) <= 5 {
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hashint := element.BigInt().Int64()
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if hashint < 0 || hashint > math.MaxUint32 {
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return hash, errors.New("bad block index")
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}
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hash = bc.GetHeaderHash(int(hashint))
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} else {
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return util.Uint256DecodeBytesBE(hashbytes)
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}
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return hash, nil
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}
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// blockToStackItem converts block.Block to stackitem.Item
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func blockToStackItem(b *block.Block) stackitem.Item {
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return stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(b.Hash().BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(b.Version))),
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stackitem.NewByteArray(b.PrevHash.BytesBE()),
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stackitem.NewByteArray(b.MerkleRoot.BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(b.Timestamp))),
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stackitem.NewBigInteger(big.NewInt(int64(b.Index))),
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stackitem.NewByteArray(b.NextConsensus.BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(len(b.Transactions)))),
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})
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}
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// bcGetBlock returns current block.
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func bcGetBlock(ic *interop.Context, v *vm.VM) error {
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hash, err := getBlockHashFromElement(ic.Chain, v.Estack().Pop())
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if err != nil {
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return err
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}
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block, err := ic.Chain.GetBlock(hash)
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if err != nil || !isTraceableBlock(ic, block.Index) {
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v.Estack().PushVal(stackitem.Null{})
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} else {
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v.Estack().PushVal(blockToStackItem(block))
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}
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return nil
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}
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// contractToStackItem converts state.Contract to stackitem.Item
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func contractToStackItem(cs *state.Contract) (stackitem.Item, error) {
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manifest, err := cs.Manifest.MarshalJSON()
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if err != nil {
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return nil, err
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}
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return stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(cs.Script),
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stackitem.NewByteArray(manifest),
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stackitem.NewBool(cs.HasStorage()),
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stackitem.NewBool(cs.IsPayable()),
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}), nil
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}
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// bcGetContract returns contract.
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func bcGetContract(ic *interop.Context, v *vm.VM) error {
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hashbytes := v.Estack().Pop().Bytes()
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hash, err := util.Uint160DecodeBytesBE(hashbytes)
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if err != nil {
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return err
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}
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cs, err := ic.DAO.GetContractState(hash)
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if err != nil {
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v.Estack().PushVal(stackitem.Null{})
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} else {
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item, err := contractToStackItem(cs)
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if err != nil {
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return err
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}
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v.Estack().PushVal(item)
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}
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return nil
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}
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// bcGetHeight returns blockchain height.
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func bcGetHeight(ic *interop.Context, v *vm.VM) error {
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v.Estack().PushVal(ic.Chain.BlockHeight())
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return nil
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}
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// getTransactionAndHeight gets parameter from the vm evaluation stack and
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// returns transaction and its height if it's present in the blockchain.
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func getTransactionAndHeight(cd *dao.Cached, v *vm.VM) (*transaction.Transaction, uint32, error) {
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hashbytes := v.Estack().Pop().Bytes()
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hash, err := util.Uint256DecodeBytesBE(hashbytes)
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if err != nil {
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return nil, 0, err
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}
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return cd.GetTransaction(hash)
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}
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// isTraceableBlock defines whether we're able to give information about
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// the block with index specified.
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func isTraceableBlock(ic *interop.Context, index uint32) bool {
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height := ic.Chain.BlockHeight()
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return index <= height && index+MaxTraceableBlocks > height
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}
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// transactionToStackItem converts transaction.Transaction to stackitem.Item
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func transactionToStackItem(t *transaction.Transaction) stackitem.Item {
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return stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(t.Hash().BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(t.Version))),
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stackitem.NewBigInteger(big.NewInt(int64(t.Nonce))),
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stackitem.NewByteArray(t.Sender.BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(t.SystemFee))),
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stackitem.NewBigInteger(big.NewInt(int64(t.NetworkFee))),
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stackitem.NewBigInteger(big.NewInt(int64(t.ValidUntilBlock))),
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stackitem.NewByteArray(t.Script),
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})
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}
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// bcGetTransaction returns transaction.
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func bcGetTransaction(ic *interop.Context, v *vm.VM) error {
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tx, h, err := getTransactionAndHeight(ic.DAO, v)
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if err != nil || !isTraceableBlock(ic, h) {
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v.Estack().PushVal(stackitem.Null{})
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return nil
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}
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v.Estack().PushVal(transactionToStackItem(tx))
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return nil
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}
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// bcGetTransactionFromBlock returns transaction with the given index from the
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// block with height or hash specified.
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func bcGetTransactionFromBlock(ic *interop.Context, v *vm.VM) error {
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hash, err := getBlockHashFromElement(ic.Chain, v.Estack().Pop())
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if err != nil {
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return err
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}
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index := v.Estack().Pop().BigInt().Int64()
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block, err := ic.DAO.GetBlock(hash)
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if err != nil || !isTraceableBlock(ic, block.Index) {
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v.Estack().PushVal(stackitem.Null{})
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return nil
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}
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if index < 0 || index >= int64(len(block.Transactions)) {
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return errors.New("wrong transaction index")
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}
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tx := block.Transactions[index]
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v.Estack().PushVal(tx.Hash().BytesBE())
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return nil
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}
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// bcGetTransactionHeight returns transaction height.
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func bcGetTransactionHeight(ic *interop.Context, v *vm.VM) error {
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_, h, err := getTransactionAndHeight(ic.DAO, v)
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if err != nil || !isTraceableBlock(ic, h) {
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v.Estack().PushVal(-1)
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return nil
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}
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v.Estack().PushVal(h)
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return nil
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}
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// engineGetScriptContainer returns transaction or block that contains the script
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// being run.
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func engineGetScriptContainer(ic *interop.Context, v *vm.VM) error {
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var item stackitem.Item
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switch t := ic.Container.(type) {
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case *transaction.Transaction:
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item = transactionToStackItem(t)
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case *block.Block:
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item = blockToStackItem(t)
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default:
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return errors.New("unknown script container")
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}
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v.Estack().PushVal(item)
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return nil
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}
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// engineGetExecutingScriptHash returns executing script hash.
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func engineGetExecutingScriptHash(ic *interop.Context, v *vm.VM) error {
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return v.PushContextScriptHash(0)
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}
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// engineGetCallingScriptHash returns calling script hash.
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func engineGetCallingScriptHash(ic *interop.Context, v *vm.VM) error {
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return v.PushContextScriptHash(1)
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}
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// engineGetEntryScriptHash returns entry script hash.
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func engineGetEntryScriptHash(ic *interop.Context, v *vm.VM) error {
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return v.PushContextScriptHash(v.Istack().Len() - 1)
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}
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// runtimePlatform returns the name of the platform.
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func runtimePlatform(ic *interop.Context, v *vm.VM) error {
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v.Estack().PushVal([]byte("NEO"))
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return nil
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}
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// runtimeGetTrigger returns the script trigger.
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func runtimeGetTrigger(ic *interop.Context, v *vm.VM) error {
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v.Estack().PushVal(byte(ic.Trigger))
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return nil
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}
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// runtimeNotify should pass stack item to the notify plugin to handle it, but
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// in neo-go the only meaningful thing to do here is to log.
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func runtimeNotify(ic *interop.Context, v *vm.VM) error {
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name := v.Estack().Pop().Bytes()
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if len(name) > MaxEventNameLen {
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return fmt.Errorf("event name must be less than %d", MaxEventNameLen)
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}
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if !utf8.Valid(name) {
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return errors.New("event name should be UTF8-encoded")
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}
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elem := v.Estack().Pop()
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args := elem.Array()
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// But it has to be serializable, otherwise we either have some broken
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// (recursive) structure inside or an interop item that can't be used
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// outside of the interop subsystem anyway. I'd probably fail transactions
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// that emit such broken notifications, but that might break compatibility
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// with testnet/mainnet, so we're replacing these with error messages.
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_, err := stackitem.SerializeItem(elem.Item())
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if err != nil {
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args = []stackitem.Item{stackitem.NewByteArray([]byte(fmt.Sprintf("bad notification: %v", err)))}
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}
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ne := state.NotificationEvent{
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ScriptHash: v.GetCurrentScriptHash(),
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Name: string(name),
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Item: stackitem.NewArray(args),
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}
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ic.Notifications = append(ic.Notifications, ne)
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return nil
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}
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// runtimeLog logs the message passed.
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func runtimeLog(ic *interop.Context, v *vm.VM) error {
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state := v.Estack().Pop().Bytes()
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if len(state) > MaxNotificationSize {
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return fmt.Errorf("message length shouldn't exceed %v", MaxNotificationSize)
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}
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if !utf8.Valid(state) {
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return errors.New("log message should be UTF8-encoded")
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}
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msg := fmt.Sprintf("%q", state)
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ic.Log.Info("runtime log",
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zap.Stringer("script", v.GetCurrentScriptHash()),
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zap.String("logs", msg))
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return nil
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}
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// runtimeGetTime returns timestamp of the block being verified, or the latest
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// one in the blockchain if no block is given to Context.
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func runtimeGetTime(ic *interop.Context, v *vm.VM) error {
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var header *block.Header
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if ic.Block == nil {
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var err error
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header, err = ic.Chain.GetHeader(ic.Chain.CurrentBlockHash())
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if err != nil {
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return err
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}
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} else {
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header = ic.Block.Header()
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}
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v.Estack().PushVal(header.Timestamp)
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return nil
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}
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// storageDelete deletes stored key-value pair.
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func storageDelete(ic *interop.Context, v *vm.VM) error {
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stcInterface := v.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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key := v.Estack().Pop().Bytes()
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si := ic.DAO.GetStorageItem(stc.ID, key)
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if si != nil && si.IsConst {
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return errors.New("storage item is constant")
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}
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return ic.DAO.DeleteStorageItem(stc.ID, key)
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}
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// storageGet returns stored key-value pair.
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func storageGet(ic *interop.Context, v *vm.VM) error {
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stcInterface := v.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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key := v.Estack().Pop().Bytes()
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si := ic.DAO.GetStorageItem(stc.ID, key)
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if si != nil && si.Value != nil {
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v.Estack().PushVal(si.Value)
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} else {
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v.Estack().PushVal(stackitem.Null{})
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}
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return nil
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}
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// storageGetContext returns storage context (scripthash).
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func storageGetContext(ic *interop.Context, v *vm.VM) error {
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return storageGetContextInternal(ic, v, false)
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}
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// storageGetReadOnlyContext returns read-only context (scripthash).
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func storageGetReadOnlyContext(ic *interop.Context, v *vm.VM) error {
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return storageGetContextInternal(ic, v, true)
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}
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// storageGetContextInternal is internal version of storageGetContext and
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// storageGetReadOnlyContext which allows to specify ReadOnly context flag.
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func storageGetContextInternal(ic *interop.Context, v *vm.VM, isReadOnly bool) error {
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contract, err := ic.DAO.GetContractState(v.GetCurrentScriptHash())
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if err != nil {
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return err
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}
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if !contract.HasStorage() {
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return errors.New("contract is not allowed to use storage")
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}
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sc := &StorageContext{
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ID: contract.ID,
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ReadOnly: isReadOnly,
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}
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v.Estack().PushVal(stackitem.NewInterop(sc))
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return nil
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}
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func putWithContextAndFlags(ic *interop.Context, v *vm.VM, stc *StorageContext, key []byte, value []byte, isConst bool) error {
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if len(key) > MaxStorageKeyLen {
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return errors.New("key is too big")
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}
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if len(value) > MaxStorageValueLen {
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return errors.New("value is too big")
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}
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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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si := ic.DAO.GetStorageItem(stc.ID, key)
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if si == nil {
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si = &state.StorageItem{}
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}
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if si.IsConst {
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return errors.New("storage item exists and is read-only")
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}
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sizeInc := 1
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if len(value) > len(si.Value) {
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sizeInc = len(value) - len(si.Value)
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}
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if !v.AddGas(int64(sizeInc) * StoragePrice) {
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return errGasLimitExceeded
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}
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si.Value = value
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si.IsConst = isConst
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return ic.DAO.PutStorageItem(stc.ID, key, si)
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}
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// storagePutInternal is a unified implementation of storagePut and storagePutEx.
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func storagePutInternal(ic *interop.Context, v *vm.VM, getFlag bool) error {
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stcInterface := v.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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key := v.Estack().Pop().Bytes()
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value := v.Estack().Pop().Bytes()
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var flag int
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if getFlag {
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flag = int(v.Estack().Pop().BigInt().Int64())
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}
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return putWithContextAndFlags(ic, v, stc, key, value, int(Constant)&flag != 0)
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}
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// storagePut puts key-value pair into the storage.
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func storagePut(ic *interop.Context, v *vm.VM) error {
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return storagePutInternal(ic, v, false)
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}
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// storagePutEx puts key-value pair with given flags into the storage.
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func storagePutEx(ic *interop.Context, v *vm.VM) error {
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return storagePutInternal(ic, v, true)
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}
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// storageContextAsReadOnly sets given context to read-only mode.
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func storageContextAsReadOnly(ic *interop.Context, v *vm.VM) error {
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stcInterface := v.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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if !stc.ReadOnly {
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stx := &StorageContext{
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ID: stc.ID,
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ReadOnly: true,
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}
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stc = stx
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}
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v.Estack().PushVal(stackitem.NewInterop(stc))
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return nil
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}
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// contractCall calls a contract.
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func contractCall(ic *interop.Context, v *vm.VM) error {
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h := v.Estack().Pop().Bytes()
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method := v.Estack().Pop().Item()
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args := v.Estack().Pop().Item()
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return contractCallExInternal(ic, v, h, method, args, smartcontract.All)
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}
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// contractCallEx calls a contract with flags.
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func contractCallEx(ic *interop.Context, v *vm.VM) error {
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h := v.Estack().Pop().Bytes()
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method := v.Estack().Pop().Item()
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args := v.Estack().Pop().Item()
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flags := smartcontract.CallFlag(int32(v.Estack().Pop().BigInt().Int64()))
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if flags&^smartcontract.All != 0 {
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return errors.New("call flags out of range")
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}
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return contractCallExInternal(ic, v, h, method, args, flags)
|
|
}
|
|
|
|
func contractCallExInternal(ic *interop.Context, v *vm.VM, h []byte, method stackitem.Item, args stackitem.Item, f smartcontract.CallFlag) error {
|
|
u, err := util.Uint160DecodeBytesBE(h)
|
|
if err != nil {
|
|
return errors.New("invalid contract hash")
|
|
}
|
|
cs, err := ic.DAO.GetContractState(u)
|
|
if err != nil {
|
|
return errors.New("contract not found")
|
|
}
|
|
bs, err := method.TryBytes()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
name := string(bs)
|
|
if strings.HasPrefix(name, "_") {
|
|
return errors.New("invalid method name (starts with '_')")
|
|
}
|
|
md := cs.Manifest.ABI.GetMethod(name)
|
|
if md == nil {
|
|
return fmt.Errorf("method '%s' not found", name)
|
|
}
|
|
curr, err := ic.DAO.GetContractState(v.GetCurrentScriptHash())
|
|
if err == nil {
|
|
if !curr.Manifest.CanCall(&cs.Manifest, string(bs)) {
|
|
return errors.New("disallowed method call")
|
|
}
|
|
}
|
|
|
|
arr, ok := args.Value().([]stackitem.Item)
|
|
if !ok {
|
|
return errors.New("second argument must be an array")
|
|
}
|
|
if len(arr) != len(md.Parameters) {
|
|
return fmt.Errorf("invalid argument count: %d (expected %d)", len(arr), len(md.Parameters))
|
|
}
|
|
|
|
ic.Invocations[u]++
|
|
v.LoadScriptWithHash(cs.Script, u, v.Context().GetCallFlags()&f)
|
|
var isNative bool
|
|
for i := range ic.Natives {
|
|
if ic.Natives[i].Metadata().Hash.Equals(u) {
|
|
isNative = true
|
|
break
|
|
}
|
|
}
|
|
if isNative {
|
|
v.Estack().PushVal(args)
|
|
v.Estack().PushVal(method)
|
|
} else {
|
|
for i := len(arr) - 1; i >= 0; i-- {
|
|
v.Estack().PushVal(arr[i])
|
|
}
|
|
// use Jump not Call here because context was loaded in LoadScript above.
|
|
v.Jump(v.Context(), md.Offset)
|
|
}
|
|
|
|
md = cs.Manifest.ABI.GetMethod(manifest.MethodInit)
|
|
if md != nil {
|
|
v.Call(v.Context(), md.Offset)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// contractDestroy destroys a contract.
|
|
func contractDestroy(ic *interop.Context, v *vm.VM) error {
|
|
hash := v.GetCurrentScriptHash()
|
|
cs, err := ic.DAO.GetContractState(hash)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
err = ic.DAO.DeleteContractState(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if cs.HasStorage() {
|
|
siMap, err := ic.DAO.GetStorageItems(cs.ID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for k := range siMap {
|
|
_ = ic.DAO.DeleteStorageItem(cs.ID, []byte(k))
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// contractIsStandard checks if contract is standard (sig or multisig) contract.
|
|
func contractIsStandard(ic *interop.Context, v *vm.VM) error {
|
|
h := v.Estack().Pop().Bytes()
|
|
u, err := util.Uint160DecodeBytesBE(h)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var result bool
|
|
cs, _ := ic.DAO.GetContractState(u)
|
|
if cs != nil {
|
|
result = vm.IsStandardContract(cs.Script)
|
|
} else {
|
|
if tx, ok := ic.Container.(*transaction.Transaction); ok {
|
|
for _, witness := range tx.Scripts {
|
|
if witness.ScriptHash() == u {
|
|
result = vm.IsStandardContract(witness.VerificationScript)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
v.Estack().PushVal(result)
|
|
return nil
|
|
}
|
|
|
|
// contractCreateStandardAccount calculates contract scripthash for a given public key.
|
|
func contractCreateStandardAccount(ic *interop.Context, v *vm.VM) error {
|
|
h := v.Estack().Pop().Bytes()
|
|
p, err := keys.NewPublicKeyFromBytes(h, elliptic.P256())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
v.Estack().PushVal(p.GetScriptHash().BytesBE())
|
|
return nil
|
|
}
|
|
|
|
// contractGetCallFlags returns current context calling flags.
|
|
func contractGetCallFlags(_ *interop.Context, v *vm.VM) error {
|
|
v.Estack().PushVal(v.Context().GetCallFlags())
|
|
return nil
|
|
}
|