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mointor: implement double sign monitor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| package monitor | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/common/prque" | ||
| "github.com/ethereum/go-ethereum/core/types" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
| "github.com/ethereum/go-ethereum/crypto/secp256k1" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| ) | ||
|
|
||
| const ( | ||
| MaxCacheHeader = 100 | ||
| ) | ||
|
|
||
| func NewDoubleSignMonitor( | ||
| extraSeal int, | ||
| sealHash func(header *types.Header) (hash common.Hash), | ||
| ) *DoubleSignMonitor { | ||
| return &DoubleSignMonitor{ | ||
| sealHash: sealHash, | ||
| extraSeal: extraSeal, | ||
| headerNumbers: prque.New(nil), | ||
| headers: make(map[uint64]*types.Header, MaxCacheHeader), | ||
| quit: make(chan struct{}), | ||
| } | ||
| } | ||
|
|
||
| type DoubleSignMonitor struct { | ||
| extraSeal int | ||
| sealHash func(header *types.Header) (hash common.Hash) | ||
| headerNumbers *prque.Prque | ||
| headers map[uint64]*types.Header | ||
| quit chan struct{} | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) getSignature(h *types.Header) ([]byte, error) { | ||
| if len(h.Extra) < m.extraSeal { | ||
| return nil, errors.New("extra-data 65 byte signature suffix missing") | ||
| } | ||
| signature := h.Extra[len(h.Extra)-m.extraSeal:] | ||
| return signature, nil | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) extractSignerFromHeader(h *types.Header) (signer common.Address, err error) { | ||
| signature, err := m.getSignature(h) | ||
| if err != nil { | ||
| return | ||
| } | ||
| pubKey, err := secp256k1.RecoverPubkey(m.sealHash(h).Bytes(), signature) | ||
| if err != nil { | ||
| return | ||
| } | ||
| copy(signer[:], crypto.Keccak256(pubKey[1:])[12:]) | ||
| return | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) isDoubleSignHeaders(h1, h2 *types.Header) (bool, []byte, []byte, error) { | ||
| if h1 == nil || h2 == nil { | ||
| return false, nil, nil, nil | ||
| } | ||
| if h1.Number.Cmp(h2.Number) != 0 { | ||
| return false, nil, nil, nil | ||
| } | ||
| if bytes.Equal(h1.ParentHash[:], h2.ParentHash[:]) { | ||
| return false, nil, nil, nil | ||
| } | ||
| signature1, err := m.getSignature(h1) | ||
| if err != nil { | ||
| return false, nil, nil, err | ||
| } | ||
| signature2, err := m.getSignature(h2) | ||
| if err != nil { | ||
| return false, nil, nil, err | ||
| } | ||
| if bytes.Equal(signature1, signature2) { | ||
| return false, signature1, signature2, nil | ||
| } | ||
|
|
||
| signer1, err := m.extractSignerFromHeader(h1) | ||
| if err != nil { | ||
| return false, signature1, signature2, err | ||
| } | ||
| signer2, err := m.extractSignerFromHeader(h2) | ||
| if err != nil { | ||
| return false, signature1, signature2, err | ||
| } | ||
| if !bytes.Equal(signer1.Bytes(), signer2.Bytes()) { | ||
| return false, signature1, signature2, nil | ||
| } | ||
|
|
||
| return true, signature1, signature2, nil | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) deleteOldHeader() { | ||
| v, _ := m.headerNumbers.Pop() | ||
| h := v.(*types.Header) | ||
| delete(m.headers, h.Number.Uint64()) | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) checkHeader(h *types.Header) (bool, *types.Header, []byte, []byte, error) { | ||
| h2, exist := m.headers[h.Number.Uint64()] | ||
| if !exist { | ||
| if m.headerNumbers.Size() > MaxCacheHeader { | ||
| m.deleteOldHeader() | ||
| } | ||
| m.headers[h.Number.Uint64()] = h | ||
| m.headerNumbers.Push(h, -h.Number.Int64()) | ||
| return false, nil, nil, nil, nil | ||
| } | ||
|
|
||
| isDoubleSign, s1, s2, err := m.isDoubleSignHeaders(h, h2) | ||
| if err != nil { | ||
| return false, nil, s1, s2, err | ||
| } | ||
| if isDoubleSign { | ||
| return true, h2, s1, s2, nil | ||
| } | ||
|
|
||
| return false, nil, s1, s2, nil | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) Start(ch <-chan *types.Header) { | ||
| for { | ||
| select { | ||
| case h := <-ch: | ||
| isDoubleSign, h2, s1, s2, err := m.checkHeader(h) | ||
| if err != nil { | ||
| log.Error("check double sign header error", "err", err) | ||
| continue | ||
| } | ||
| if isDoubleSign { | ||
| // found a double sign header | ||
| log.Error("found a double sign header", "number", h.Number.Uint64(), | ||
| "first_hash", h.Hash(), "first_miner", h.Coinbase, "first_signature", s1, | ||
| "second_hash", h2.Hash(), "second_miner", h2.Coinbase, "second_signature", s2) | ||
| } | ||
| case <-m.quit: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (m *DoubleSignMonitor) Close() { | ||
| close(m.quit) | ||
| } |
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