forked from cerc-io/plugeth
92580d69d3
This commit affects p2p/discv5 "topic discovery" by running it on the same UDP port where the old discovery works. This is realized by giving an "unhandled" packet channel to the old v4 discovery packet handler where all invalid packets are sent. These packets are then processed by v5. v5 packets are always invalid when interpreted by v4 and vice versa. This is ensured by adding one to the first byte of the packet hash in v5 packets. DiscoveryV5Bootnodes is also changed to point to new bootnodes that are implementing the changed packet format with modified hash. Existing and new v5 bootnodes are both running on different ports ATM.
230 lines
7.1 KiB
Go
230 lines
7.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package les implements the Light Ethereum Subprotocol.
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package les
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import (
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"bytes"
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"crypto/ecdsa"
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"crypto/elliptic"
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"errors"
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"fmt"
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"io"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/crypto/secp256k1"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// Constants to match up protocol versions and messages
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const (
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lpv1 = 1
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lpv2 = 2
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)
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// Supported versions of the les protocol (first is primary)
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var (
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ClientProtocolVersions = []uint{lpv2, lpv1}
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ServerProtocolVersions = []uint{lpv2, lpv1}
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AdvertiseProtocolVersions = []uint{lpv2} // clients are searching for the first advertised protocol in the list
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)
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// Number of implemented message corresponding to different protocol versions.
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var ProtocolLengths = map[uint]uint64{lpv1: 15, lpv2: 22}
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const (
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NetworkId = 1
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ProtocolMaxMsgSize = 10 * 1024 * 1024 // Maximum cap on the size of a protocol message
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)
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// les protocol message codes
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const (
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// Protocol messages belonging to LPV1
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StatusMsg = 0x00
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AnnounceMsg = 0x01
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GetBlockHeadersMsg = 0x02
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BlockHeadersMsg = 0x03
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GetBlockBodiesMsg = 0x04
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BlockBodiesMsg = 0x05
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GetReceiptsMsg = 0x06
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ReceiptsMsg = 0x07
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GetProofsV1Msg = 0x08
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ProofsV1Msg = 0x09
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GetCodeMsg = 0x0a
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CodeMsg = 0x0b
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SendTxMsg = 0x0c
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GetHeaderProofsMsg = 0x0d
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HeaderProofsMsg = 0x0e
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// Protocol messages belonging to LPV2
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GetProofsV2Msg = 0x0f
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ProofsV2Msg = 0x10
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GetHelperTrieProofsMsg = 0x11
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HelperTrieProofsMsg = 0x12
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SendTxV2Msg = 0x13
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GetTxStatusMsg = 0x14
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TxStatusMsg = 0x15
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)
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type errCode int
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const (
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ErrMsgTooLarge = iota
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ErrDecode
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ErrInvalidMsgCode
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ErrProtocolVersionMismatch
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ErrNetworkIdMismatch
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ErrGenesisBlockMismatch
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ErrNoStatusMsg
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ErrExtraStatusMsg
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ErrSuspendedPeer
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ErrUselessPeer
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ErrRequestRejected
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ErrUnexpectedResponse
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ErrInvalidResponse
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ErrTooManyTimeouts
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ErrMissingKey
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)
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func (e errCode) String() string {
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return errorToString[int(e)]
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}
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// XXX change once legacy code is out
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var errorToString = map[int]string{
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ErrMsgTooLarge: "Message too long",
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ErrDecode: "Invalid message",
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ErrInvalidMsgCode: "Invalid message code",
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ErrProtocolVersionMismatch: "Protocol version mismatch",
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ErrNetworkIdMismatch: "NetworkId mismatch",
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ErrGenesisBlockMismatch: "Genesis block mismatch",
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ErrNoStatusMsg: "No status message",
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ErrExtraStatusMsg: "Extra status message",
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ErrSuspendedPeer: "Suspended peer",
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ErrRequestRejected: "Request rejected",
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ErrUnexpectedResponse: "Unexpected response",
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ErrInvalidResponse: "Invalid response",
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ErrTooManyTimeouts: "Too many request timeouts",
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ErrMissingKey: "Key missing from list",
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}
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type announceBlock struct {
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Hash common.Hash // Hash of one particular block being announced
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Number uint64 // Number of one particular block being announced
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Td *big.Int // Total difficulty of one particular block being announced
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}
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// announceData is the network packet for the block announcements.
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type announceData struct {
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Hash common.Hash // Hash of one particular block being announced
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Number uint64 // Number of one particular block being announced
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Td *big.Int // Total difficulty of one particular block being announced
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ReorgDepth uint64
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Update keyValueList
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}
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// sign adds a signature to the block announcement by the given privKey
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func (a *announceData) sign(privKey *ecdsa.PrivateKey) {
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rlp, _ := rlp.EncodeToBytes(announceBlock{a.Hash, a.Number, a.Td})
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sig, _ := crypto.Sign(crypto.Keccak256(rlp), privKey)
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a.Update = a.Update.add("sign", sig)
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}
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// checkSignature verifies if the block announcement has a valid signature by the given pubKey
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func (a *announceData) checkSignature(pubKey *ecdsa.PublicKey) error {
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var sig []byte
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if err := a.Update.decode().get("sign", &sig); err != nil {
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return err
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}
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rlp, _ := rlp.EncodeToBytes(announceBlock{a.Hash, a.Number, a.Td})
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recPubkey, err := secp256k1.RecoverPubkey(crypto.Keccak256(rlp), sig)
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if err != nil {
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return err
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}
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pbytes := elliptic.Marshal(pubKey.Curve, pubKey.X, pubKey.Y)
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if bytes.Equal(pbytes, recPubkey) {
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return nil
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} else {
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return errors.New("Wrong signature")
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}
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}
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type blockInfo struct {
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Hash common.Hash // Hash of one particular block being announced
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Number uint64 // Number of one particular block being announced
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Td *big.Int // Total difficulty of one particular block being announced
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}
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// getBlockHeadersData represents a block header query.
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type getBlockHeadersData struct {
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Origin hashOrNumber // Block from which to retrieve headers
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Amount uint64 // Maximum number of headers to retrieve
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Skip uint64 // Blocks to skip between consecutive headers
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Reverse bool // Query direction (false = rising towards latest, true = falling towards genesis)
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}
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// hashOrNumber is a combined field for specifying an origin block.
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type hashOrNumber struct {
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Hash common.Hash // Block hash from which to retrieve headers (excludes Number)
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Number uint64 // Block hash from which to retrieve headers (excludes Hash)
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}
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// EncodeRLP is a specialized encoder for hashOrNumber to encode only one of the
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// two contained union fields.
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func (hn *hashOrNumber) EncodeRLP(w io.Writer) error {
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if hn.Hash == (common.Hash{}) {
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return rlp.Encode(w, hn.Number)
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}
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if hn.Number != 0 {
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return fmt.Errorf("both origin hash (%x) and number (%d) provided", hn.Hash, hn.Number)
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}
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return rlp.Encode(w, hn.Hash)
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}
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// DecodeRLP is a specialized decoder for hashOrNumber to decode the contents
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// into either a block hash or a block number.
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func (hn *hashOrNumber) DecodeRLP(s *rlp.Stream) error {
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_, size, _ := s.Kind()
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origin, err := s.Raw()
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if err == nil {
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switch {
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case size == 32:
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err = rlp.DecodeBytes(origin, &hn.Hash)
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case size <= 8:
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err = rlp.DecodeBytes(origin, &hn.Number)
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default:
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err = fmt.Errorf("invalid input size %d for origin", size)
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}
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}
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return err
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}
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// CodeData is the network response packet for a node data retrieval.
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type CodeData []struct {
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Value []byte
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}
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type proofsData [][]rlp.RawValue
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type txStatus struct {
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Status core.TxStatus
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Lookup *core.TxLookupEntry
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Error error
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}
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