334 lines
11 KiB
Go
334 lines
11 KiB
Go
package full
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import (
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"bytes"
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"context"
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"encoding/binary"
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"fmt"
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"io"
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"github.com/multiformats/go-multicodec"
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cbg "github.com/whyrusleeping/cbor-gen"
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"golang.org/x/xerrors"
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"github.com/filecoin-project/go-state-types/abi"
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"github.com/filecoin-project/go-state-types/builtin"
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"github.com/filecoin-project/go-state-types/exitcode"
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builtinactors "github.com/filecoin-project/lotus/chain/actors/builtin"
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"github.com/filecoin-project/lotus/chain/types"
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"github.com/filecoin-project/lotus/chain/types/ethtypes"
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)
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func decodePayload(payload []byte, codec uint64) (ethtypes.EthBytes, error) {
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if len(payload) == 0 {
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return ethtypes.EthBytes(nil), nil
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}
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switch multicodec.Code(codec) {
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case multicodec.Identity:
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return ethtypes.EthBytes(nil), nil
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case multicodec.DagCbor, multicodec.Cbor:
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buf, err := cbg.ReadByteArray(bytes.NewReader(payload), uint64(len(payload)))
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if err != nil {
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return nil, xerrors.Errorf("decodePayload: failed to decode cbor payload: %w", err)
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}
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return buf, nil
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case multicodec.Raw:
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return ethtypes.EthBytes(payload), nil
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}
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return nil, xerrors.Errorf("decodePayload: unsupported codec: %d", codec)
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}
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// buildTraces recursively builds the traces for a given ExecutionTrace by walking the subcalls
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func buildTraces(ctx context.Context, traces *[]*ethtypes.EthTrace, parent *ethtypes.EthTrace, addr []int, et types.ExecutionTrace, height int64, sa StateAPI) error {
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// lookup the eth address from the from/to addresses. Note that this may fail but to support
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// this we need to include the ActorID in the trace. For now, just log a warning and skip
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// this trace.
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//
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// TODO: Add ActorID in trace, see https://github.com/filecoin-project/lotus/pull/11100#discussion_r1302442288
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from, err := lookupEthAddress(ctx, et.Msg.From, sa)
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if err != nil {
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log.Warnf("buildTraces: failed to lookup from address %s: %v", et.Msg.From, err)
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return nil
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}
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to, err := lookupEthAddress(ctx, et.Msg.To, sa)
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if err != nil {
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log.Warnf("buildTraces: failed to lookup to address %s: %w", et.Msg.To, err)
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return nil
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}
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trace := ðtypes.EthTrace{
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Action: ethtypes.EthTraceAction{
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From: from.String(),
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To: to.String(),
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Gas: ethtypes.EthUint64(et.Msg.GasLimit),
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Input: nil,
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Value: ethtypes.EthBigInt(et.Msg.Value),
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Method: et.Msg.Method,
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CodeCid: et.Msg.CodeCid,
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},
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Result: ethtypes.EthTraceResult{
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GasUsed: ethtypes.EthUint64(et.SumGas().TotalGas),
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Output: nil,
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},
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Subtraces: len(et.Subcalls),
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TraceAddress: addr,
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Parent: parent,
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}
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trace.SetCallType("call")
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if parent != nil && builtinactors.IsEvmActor(parent.Action.CodeCid) && et.Msg.Method == builtin.MethodsEVM.InvokeContract {
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log.Debugf("found InvokeContract call at height: %d", height)
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trace.Action.Input, err = decodePayload(et.Msg.Params, et.Msg.ParamsCodec)
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if err != nil {
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return xerrors.Errorf("buildTraces: %w", err)
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}
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trace.Result.Output, err = decodePayload(et.MsgRct.Return, et.MsgRct.ReturnCodec)
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if err != nil {
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return xerrors.Errorf("buildTraces: %w", err)
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}
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} else if et.Msg.To == builtin.EthereumAddressManagerActorAddr &&
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et.Msg.Method == builtin.MethodsEAM.CreateExternal {
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log.Debugf("found CreateExternal call at height: %d", height)
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trace.Action.Input, err = decodePayload(et.Msg.Params, et.Msg.ParamsCodec)
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if err != nil {
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return xerrors.Errorf("buildTraces: %w", err)
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}
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if et.MsgRct.ExitCode.IsSuccess() {
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// ignore return value
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trace.Result.Output = nil
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} else {
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// return value is the error message
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trace.Result.Output, err = decodePayload(et.MsgRct.Return, et.MsgRct.ReturnCodec)
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if err != nil {
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return xerrors.Errorf("buildTraces: %w", err)
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}
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}
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// treat this as a contract creation
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trace.SetCallType("create")
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} else {
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trace.Action.Input, err = handleFilecoinMethodInput(et.Msg.Method, et.Msg.ParamsCodec, et.Msg.Params)
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if err != nil {
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return xerrors.Errorf("buildTraces: %w", err)
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}
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trace.Result.Output, err = handleFilecoinMethodOutput(et.MsgRct.ExitCode, et.MsgRct.ReturnCodec, et.MsgRct.Return)
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if err != nil {
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return xerrors.Errorf("buildTraces: %w", err)
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}
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}
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// TODO: is it OK to check this here or is this only specific to certain edge case (evm to evm)?
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if et.Msg.ReadOnly {
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trace.SetCallType("staticcall")
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}
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// there are several edge cases thar require special handling when displaying the traces
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if parent != nil {
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// Handle Native actor creation
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//
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// Actor A calls to the init actor on method 2 and The init actor creates the target actor B then calls it on method 1
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if parent.Action.To == builtin.InitActorAddr.String() &&
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parent.Action.Method == builtin.MethodsInit.Exec &&
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et.Msg.Method == builtin.MethodConstructor {
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log.Debugf("Native actor creation! method:%d, code:%s, height:%d", et.Msg.Method, et.Msg.CodeCid.String(), height)
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parent.SetCallType("create")
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parent.Action.To = et.Msg.To.String()
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parent.Action.Input = []byte{0x0, 0x0, 0x0, 0xFE}
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parent.Result.Output = nil
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// there should never be any subcalls when creating a native actor
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return nil
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}
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// Handle EVM contract creation
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//
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// To detect EVM contract creation we need to check for the following sequence of events:
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//
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// 1) EVM contract A calls the EAM (Ethereum Address Manager) on method 2 (create) or 3 (create2).
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// 2) The EAM calls the init actor on method 3 (Exec4).
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// 3) The init actor creates the target actor B then calls it on method 1.
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if parent.Parent != nil {
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calledCreateOnEAM := parent.Parent.Action.To == builtin.EthereumAddressManagerActorAddr.String() &&
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(parent.Parent.Action.Method == builtin.MethodsEAM.Create || parent.Parent.Action.Method == builtin.MethodsEAM.Create2)
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eamCalledInitOnExec4 := parent.Action.To == builtin.InitActorAddr.String() &&
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parent.Action.Method == builtin.MethodsInit.Exec4
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initCreatedActor := trace.Action.Method == builtin.MethodConstructor
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if calledCreateOnEAM && eamCalledInitOnExec4 && initCreatedActor {
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log.Debugf("EVM contract creation method:%d, code:%s, height:%d", et.Msg.Method, et.Msg.CodeCid.String(), height)
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if parent.Parent.Action.Method == builtin.MethodsEAM.Create {
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parent.Parent.SetCallType("create")
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} else {
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parent.Parent.SetCallType("create2")
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}
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// update the parent.parent to make this
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parent.Parent.Action.To = trace.Action.To
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parent.Parent.Subtraces = 0
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// delete the parent (the EAM) and skip the current trace (init)
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*traces = (*traces)[:len(*traces)-1]
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return nil
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}
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}
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// Handle EVM call special casing
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//
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// Any outbound call from an EVM actor on methods 1-1023 are side-effects from EVM instructions
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// and should be dropped from the trace.
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if builtinactors.IsEvmActor(parent.Action.CodeCid) &&
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et.Msg.Method > 0 &&
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et.Msg.Method <= 1023 {
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log.Debugf("found outbound call from an EVM actor on method 1-1023 method:%d, code:%s, height:%d", et.Msg.Method, parent.Action.CodeCid.String(), height)
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// TODO: if I handle this case and drop this call from the trace then I am not able to detect delegate calls
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}
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// EVM -> EVM calls
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//
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// Check for normal EVM to EVM calls and decode the params and return values
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if builtinactors.IsEvmActor(parent.Action.CodeCid) &&
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builtinactors.IsEthAccountActor(et.Msg.CodeCid) &&
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et.Msg.Method == builtin.MethodsEVM.InvokeContract {
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log.Debugf("found evm to evm call, code:%s, height: %d", et.Msg.CodeCid.String(), height)
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input, err := handleFilecoinMethodInput(et.Msg.Method, et.Msg.ParamsCodec, et.Msg.Params)
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if err != nil {
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return err
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}
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trace.Action.Input = input
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output, err := handleFilecoinMethodOutput(et.MsgRct.ExitCode, et.MsgRct.ReturnCodec, et.MsgRct.Return)
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if err != nil {
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return err
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}
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trace.Result.Output = output
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}
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// Handle delegate calls
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//
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// 1) Look for trace from an EVM actor to itself on InvokeContractDelegate, method 6.
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// 2) Check that the previous trace calls another actor on method 3 (GetByteCode) and they are at the same level (same parent)
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// 3) Treat this as a delegate call to actor A.
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if trace.Action.From == trace.Action.To &&
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trace.Action.Method == builtin.MethodsEVM.InvokeContractDelegate &&
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len(*traces) > 0 {
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log.Debugf("found delegate call, height: %d", height)
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prev := (*traces)[len(*traces)-1]
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if prev.Action.From == trace.Action.From && prev.Action.Method == builtin.MethodsEVM.GetBytecode && prev.Parent == trace.Parent {
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trace.SetCallType("delegatecall")
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trace.Action.To = prev.Action.To
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}
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}
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}
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*traces = append(*traces, trace)
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for i, call := range et.Subcalls {
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err := buildTraces(ctx, traces, trace, append(addr, i), call, height, sa)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func writePadded(w io.Writer, data any, size int) error {
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tmp := &bytes.Buffer{}
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// first write data to tmp buffer to get the size
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err := binary.Write(tmp, binary.BigEndian, data)
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if err != nil {
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return fmt.Errorf("writePadded: failed writing tmp data to buffer: %w", err)
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}
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if tmp.Len() > size {
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return fmt.Errorf("writePadded: data is larger than size")
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}
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// write tailing zeros to pad up to size
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cnt := size - tmp.Len()
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for i := 0; i < cnt; i++ {
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err = binary.Write(w, binary.BigEndian, uint8(0))
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if err != nil {
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return fmt.Errorf("writePadded: failed writing tailing zeros to buffer: %w", err)
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}
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}
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// finally write the actual value
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err = binary.Write(w, binary.BigEndian, tmp.Bytes())
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if err != nil {
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return fmt.Errorf("writePadded: failed writing data to buffer: %w", err)
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}
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return nil
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}
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func handleFilecoinMethodInput(method abi.MethodNum, codec uint64, params []byte) ([]byte, error) {
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NATIVE_METHOD_SELECTOR := []byte{0x86, 0x8e, 0x10, 0xc4}
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EVM_WORD_SIZE := 32
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staticArgs := []uint64{
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uint64(method),
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codec,
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uint64(EVM_WORD_SIZE) * 3,
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uint64(len(params)),
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}
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totalWords := len(staticArgs) + (len(params) / EVM_WORD_SIZE)
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if len(params)%EVM_WORD_SIZE != 0 {
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totalWords++
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}
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len := 4 + totalWords*EVM_WORD_SIZE
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w := &bytes.Buffer{}
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err := binary.Write(w, binary.BigEndian, NATIVE_METHOD_SELECTOR)
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if err != nil {
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return nil, fmt.Errorf("handleFilecoinMethodInput: failed writing method selector: %w", err)
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}
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for _, arg := range staticArgs {
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err := writePadded(w, arg, 32)
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if err != nil {
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return nil, fmt.Errorf("handleFilecoinMethodInput: %w", err)
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}
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}
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err = binary.Write(w, binary.BigEndian, params)
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if err != nil {
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return nil, fmt.Errorf("handleFilecoinMethodInput: failed writing params: %w", err)
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}
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remain := len - w.Len()
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for i := 0; i < remain; i++ {
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err = binary.Write(w, binary.BigEndian, uint8(0))
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if err != nil {
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return nil, fmt.Errorf("handleFilecoinMethodInput: failed writing tailing zeros: %w", err)
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}
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}
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return w.Bytes(), nil
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}
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func handleFilecoinMethodOutput(exitCode exitcode.ExitCode, codec uint64, data []byte) ([]byte, error) {
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w := &bytes.Buffer{}
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values := []interface{}{uint32(exitCode), codec, uint32(w.Len()), uint32(len(data))}
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for _, v := range values {
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err := writePadded(w, v, 32)
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if err != nil {
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return nil, fmt.Errorf("handleFilecoinMethodOutput: %w", err)
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}
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}
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err := binary.Write(w, binary.BigEndian, data)
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if err != nil {
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return nil, fmt.Errorf("handleFilecoinMethodOutput: failed writing data: %w", err)
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}
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return w.Bytes(), nil
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}
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