eth/filter: bugfix which can cause a nil pointer crash when parsing filter arguments
This commit is contained in:
Bas van Kervel
parent
c8a8ad97f7
commit
67cd4ee8d2
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@ -233,6 +233,7 @@ func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []commo
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return id, nil
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}
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// Logs creates a subscription that fires for all new log that match the given filter criteria.
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func (s *PublicFilterAPI) Logs(ctx context.Context, args NewFilterArgs) (rpc.Subscription, error) {
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notifier, supported := rpc.NotifierFromContext(ctx)
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if !supported {
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@ -291,12 +292,13 @@ type NewFilterArgs struct {
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Topics [][]common.Hash
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}
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// UnmarshalJSON sets *args fields with given data.
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func (args *NewFilterArgs) UnmarshalJSON(data []byte) error {
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type input struct {
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From *rpc.BlockNumber `json:"fromBlock"`
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ToBlock *rpc.BlockNumber `json:"toBlock"`
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Addresses interface{} `json:"address"`
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Topics interface{} `json:"topics"`
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Topics []interface{} `json:"topics"`
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}
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var raw input
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@ -321,7 +323,6 @@ func (args *NewFilterArgs) UnmarshalJSON(data []byte) error {
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if raw.Addresses != nil {
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// raw.Address can contain a single address or an array of addresses
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var addresses []common.Address
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if strAddrs, ok := raw.Addresses.([]interface{}); ok {
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for i, addr := range strAddrs {
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if strAddr, ok := addr.(string); ok {
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@ -352,56 +353,53 @@ func (args *NewFilterArgs) UnmarshalJSON(data []byte) error {
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args.Addresses = addresses
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}
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// helper function which parses a string to a topic hash
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topicConverter := func(raw string) (common.Hash, error) {
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if len(raw) == 0 {
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return common.Hash{}, nil
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}
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if len(raw) >= 2 && raw[0] == '0' && (raw[1] == 'x' || raw[1] == 'X') {
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raw = raw[2:]
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}
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if len(raw) != 2 * common.HashLength {
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return common.Hash{}, errors.New("invalid topic(s)")
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}
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if decAddr, err := hex.DecodeString(raw); err == nil {
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return common.BytesToHash(decAddr), nil
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}
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return common.Hash{}, errors.New("invalid topic given")
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return common.Hash{}, errors.New("invalid topic(s)")
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}
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// topics is an array consisting of strings or arrays of strings
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if raw.Topics != nil {
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topics, ok := raw.Topics.([]interface{})
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if ok {
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parsedTopics := make([][]common.Hash, len(topics))
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for i, topic := range topics {
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if topic == nil {
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parsedTopics[i] = []common.Hash{common.StringToHash("")}
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} else if strTopic, ok := topic.(string); ok {
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if t, err := topicConverter(strTopic); err != nil {
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return fmt.Errorf("invalid topic on index %d", i)
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} else {
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parsedTopics[i] = []common.Hash{t}
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}
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} else if arrTopic, ok := topic.([]interface{}); ok {
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parsedTopics[i] = make([]common.Hash, len(arrTopic))
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for j := 0; j < len(parsedTopics[i]); i++ {
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if arrTopic[j] == nil {
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parsedTopics[i][j] = common.StringToHash("")
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} else if str, ok := arrTopic[j].(string); ok {
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if t, err := topicConverter(str); err != nil {
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return fmt.Errorf("invalid topic on index %d", i)
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} else {
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parsedTopics[i] = []common.Hash{t}
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}
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} else {
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return fmt.Errorf("topic[%d][%d] not a string", i, j)
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}
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}
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} else {
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return fmt.Errorf("topic[%d] invalid", i)
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// topics is an array consisting of strings and/or arrays of strings.
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// JSON null values are converted to common.Hash{} and ignored by the filter manager.
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if len(raw.Topics) > 0 {
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args.Topics = make([][]common.Hash, len(raw.Topics))
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for i, t := range raw.Topics {
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if t == nil { // ignore topic when matching logs
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args.Topics[i] = []common.Hash{common.Hash{}}
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} else if topic, ok := t.(string); ok { // match specific topic
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top, err := topicConverter(topic)
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if err != nil {
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return err
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}
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args.Topics[i] = []common.Hash{top}
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} else if topics, ok := t.([]interface{}); ok { // or case e.g. [null, "topic0", "topic1"]
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for _, rawTopic := range topics {
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if rawTopic == nil {
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args.Topics[i] = append(args.Topics[i], common.Hash{})
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} else if topic, ok := rawTopic.(string); ok {
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parsed, err := topicConverter(topic)
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if err != nil {
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return err
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}
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args.Topics[i] = append(args.Topics[i], parsed)
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} else {
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return fmt.Errorf("invalid topic(s)")
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}
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}
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} else {
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return fmt.Errorf("invalid topic(s)")
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}
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args.Topics = parsedTopics
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}
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}
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@ -0,0 +1,198 @@
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// 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 filters_test
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import (
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"encoding/json"
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"fmt"
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"testing"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/eth/filters"
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"github.com/ethereum/go-ethereum/rpc"
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)
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func TestUnmarshalJSONNewFilterArgs(t *testing.T) {
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var (
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fromBlock rpc.BlockNumber = 0x123435
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toBlock rpc.BlockNumber = 0xabcdef
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address0 = common.StringToAddress("70c87d191324e6712a591f304b4eedef6ad9bb9d")
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address1 = common.StringToAddress("9b2055d370f73ec7d8a03e965129118dc8f5bf83")
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topic0 = common.HexToHash("3ac225168df54212a25c1c01fd35bebfea408fdac2e31ddd6f80a4bbf9a5f1ca")
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topic1 = common.HexToHash("9084a792d2f8b16a62b882fd56f7860c07bf5fa91dd8a2ae7e809e5180fef0b3")
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topic2 = common.HexToHash("6ccae1c4af4152f460ff510e573399795dfab5dcf1fa60d1f33ac8fdc1e480ce")
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nullTopic = common.Hash{}
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)
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// default values
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var test0 filters.NewFilterArgs
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if err := json.Unmarshal([]byte("{}"), &test0); err != nil {
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t.Fatal(err)
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}
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if test0.FromBlock != rpc.LatestBlockNumber {
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t.Fatalf("expected %d, got %d", rpc.LatestBlockNumber, test0.FromBlock)
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}
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if test0.ToBlock != rpc.LatestBlockNumber {
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t.Fatalf("expected %d, got %d", rpc.LatestBlockNumber, test0.ToBlock)
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}
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if len(test0.Addresses) != 0 {
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t.Fatalf("expected 0 addresses, got %d", len(test0.Addresses))
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}
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if len(test0.Topics) != 0 {
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t.Fatalf("expected 0 topics, got %d topics", len(test0.Topics))
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}
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// from, to block number
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var test1 filters.NewFilterArgs
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vector := fmt.Sprintf(`{"fromBlock":"0x%x","toBlock":"0x%x"}`, fromBlock, toBlock)
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if err := json.Unmarshal([]byte(vector), &test1); err != nil {
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t.Fatal(err)
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}
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if test1.FromBlock != fromBlock {
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t.Fatalf("expected FromBlock %d, got %d", fromBlock, test1.FromBlock)
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}
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if test1.ToBlock != toBlock {
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t.Fatalf("expected ToBlock %d, got %d", toBlock, test1.ToBlock)
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}
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// single address
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var test2 filters.NewFilterArgs
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vector = fmt.Sprintf(`{"address": "%s"}`, address0.Hex())
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if err := json.Unmarshal([]byte(vector), &test2); err != nil {
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t.Fatal(err)
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}
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if len(test2.Addresses) != 1 {
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t.Fatalf("expected 1 address, got %d address(es)", len(test2.Addresses))
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}
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if test2.Addresses[0] != address0 {
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t.Fatalf("expected address %x, got %x", address0, test2.Addresses[0])
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}
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// multiple address
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var test3 filters.NewFilterArgs
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vector = fmt.Sprintf(`{"address": ["%s", "%s"]}`, address0.Hex(), address1.Hex())
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if err := json.Unmarshal([]byte(vector), &test3); err != nil {
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t.Fatal(err)
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}
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if len(test3.Addresses) != 2 {
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t.Fatalf("expected 2 addresses, got %d address(es)", len(test3.Addresses))
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}
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if test3.Addresses[0] != address0 {
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t.Fatalf("expected address %x, got %x", address0, test3.Addresses[0])
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}
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if test3.Addresses[1] != address1 {
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t.Fatalf("expected address %x, got %x", address1, test3.Addresses[1])
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}
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// single topic
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var test4 filters.NewFilterArgs
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vector = fmt.Sprintf(`{"topics": ["%s"]}`, topic0.Hex())
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if err := json.Unmarshal([]byte(vector), &test4); err != nil {
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t.Fatal(err)
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}
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if len(test4.Topics) != 1 {
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t.Fatalf("expected 1 topic, got %d", len(test4.Topics))
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}
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if len(test4.Topics[0]) != 1 {
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t.Fatalf("expected len(topics[0]) to be 1, got %d", len(test4.Topics[0]))
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}
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if test4.Topics[0][0] != topic0 {
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t.Fatalf("got %x, expected %x", test4.Topics[0][0], topic0)
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}
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// test multiple "AND" topics
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var test5 filters.NewFilterArgs
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vector = fmt.Sprintf(`{"topics": ["%s", "%s"]}`, topic0.Hex(), topic1.Hex())
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if err := json.Unmarshal([]byte(vector), &test5); err != nil {
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t.Fatal(err)
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}
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if len(test5.Topics) != 2 {
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t.Fatalf("expected 2 topics, got %d", len(test5.Topics))
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}
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if len(test5.Topics[0]) != 1 {
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t.Fatalf("expected 1 topic, got %d", len(test5.Topics[0]))
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}
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if test5.Topics[0][0] != topic0 {
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t.Fatalf("got %x, expected %x", test5.Topics[0][0], topic0)
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}
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if len(test5.Topics[1]) != 1 {
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t.Fatalf("expected 1 topic, got %d", len(test5.Topics[1]))
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}
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if test5.Topics[1][0] != topic1 {
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t.Fatalf("got %x, expected %x", test5.Topics[1][0], topic1)
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}
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// test optional topic
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var test6 filters.NewFilterArgs
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vector = fmt.Sprintf(`{"topics": ["%s", null, "%s"]}`, topic0.Hex(), topic2.Hex())
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if err := json.Unmarshal([]byte(vector), &test6); err != nil {
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t.Fatal(err)
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}
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if len(test6.Topics) != 3 {
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t.Fatalf("expected 3 topics, got %d", len(test6.Topics))
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}
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if len(test6.Topics[0]) != 1 {
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t.Fatalf("expected 1 topic, got %d", len(test6.Topics[0]))
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}
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if test6.Topics[0][0] != topic0 {
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t.Fatalf("got %x, expected %x", test6.Topics[0][0], topic0)
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}
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if len(test6.Topics[1]) != 1 {
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t.Fatalf("expected 1 topic, got %d", len(test6.Topics[1]))
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}
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if test6.Topics[1][0] != nullTopic {
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t.Fatalf("got %x, expected empty hash", test6.Topics[1][0])
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}
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if len(test6.Topics[2]) != 1 {
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t.Fatalf("expected 1 topic, got %d", len(test6.Topics[2]))
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}
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if test6.Topics[2][0] != topic2 {
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t.Fatalf("got %x, expected %x", test6.Topics[2][0], topic2)
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}
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// test OR topics
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var test7 filters.NewFilterArgs
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vector = fmt.Sprintf(`{"topics": [["%s", "%s"], null, ["%s", null]]}`, topic0.Hex(), topic1.Hex(), topic2.Hex())
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if err := json.Unmarshal([]byte(vector), &test7); err != nil {
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t.Fatal(err)
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}
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if len(test7.Topics) != 3 {
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t.Fatalf("expected 3 topics, got %d topics", len(test7.Topics))
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}
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if len(test7.Topics[0]) != 2 {
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t.Fatalf("expected 2 topics, got %d topics", len(test7.Topics[0]))
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}
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if test7.Topics[0][0] != topic0 || test7.Topics[0][1] != topic1 {
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t.Fatalf("invalid topics expected [%x,%x], got [%x,%x]",
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topic0, topic1, test7.Topics[0][0], test7.Topics[0][1],
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)
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}
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if len(test7.Topics[1]) != 1 {
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t.Fatalf("expected 1 topic, got %d topics", len(test7.Topics[1]))
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}
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if test7.Topics[1][0] != nullTopic {
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t.Fatalf("expected empty hash, got %x", test7.Topics[1][0])
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}
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if len(test7.Topics[2]) != 2 {
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t.Fatalf("expected 2 topics, got %d topics", len(test7.Topics[2]))
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}
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if test7.Topics[2][0] != topic2 || test7.Topics[2][1] != nullTopic {
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t.Fatalf("invalid topics expected [%x,%x], got [%x,%x]",
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topic2, nullTopic, test7.Topics[2][0], test7.Topics[2][1],
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)
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}
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}
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