mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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171 lines
4.4 KiB
Go
171 lines
4.4 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// go-ethereum 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package mailserver
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import (
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"bytes"
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"encoding/binary"
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"github.com/ethereum/go-ethereum/cmd/utils"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/rlp"
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whisper "github.com/ethereum/go-ethereum/whisper/whisperv5"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/util"
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)
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const MailServerKeyName = "958e04ab302fb36ad2616a352cbac79d"
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type WMailServer struct {
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db *leveldb.DB
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w *whisper.Whisper
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pow float64
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key []byte
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}
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type DBKey struct {
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timestamp uint32
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hash common.Hash
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raw []byte
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}
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func NewDbKey(t uint32, h common.Hash) *DBKey {
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const sz = common.HashLength + 4
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var k DBKey
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k.timestamp = t
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k.hash = h
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k.raw = make([]byte, sz)
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binary.BigEndian.PutUint32(k.raw, k.timestamp)
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copy(k.raw[4:], k.hash[:])
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return &k
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}
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func (s *WMailServer) Init(shh *whisper.Whisper, path string, password string, pow float64) {
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var err error
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if len(path) == 0 {
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utils.Fatalf("DB file is not specified")
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}
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if len(password) == 0 {
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utils.Fatalf("Password is not specified for MailServer")
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}
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s.db, err = leveldb.OpenFile(path, nil)
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if err != nil {
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utils.Fatalf("Failed to open DB file: %s", err)
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}
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s.w = shh
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s.pow = pow
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err = s.w.AddSymKey(MailServerKeyName, []byte(password))
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if err != nil {
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utils.Fatalf("Failed to create symmetric key for MailServer: %s", err)
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}
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s.key = s.w.GetSymKey(MailServerKeyName)
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}
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func (s *WMailServer) Close() {
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if s.db != nil {
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s.db.Close()
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}
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}
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func (s *WMailServer) Archive(env *whisper.Envelope) {
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key := NewDbKey(env.Expiry-env.TTL, env.Hash())
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rawEnvelope, err := rlp.EncodeToBytes(env)
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if err != nil {
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glog.V(logger.Error).Infof("rlp.EncodeToBytes failed: %s", err)
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} else {
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err = s.db.Put(key.raw, rawEnvelope, nil)
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if err != nil {
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glog.V(logger.Error).Infof("Writing to DB failed: %s", err)
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}
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}
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}
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func (s *WMailServer) DeliverMail(peer *whisper.Peer, request *whisper.Envelope) {
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ok, lower, upper, topic := s.validate(peer, request)
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if !ok {
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return
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}
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var err error
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var zero common.Hash
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var empty whisper.TopicType
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kl := NewDbKey(lower, zero)
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ku := NewDbKey(upper, zero)
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i := s.db.NewIterator(&util.Range{Start: kl.raw, Limit: ku.raw}, nil)
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defer i.Release()
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for i.Next() {
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var envelope whisper.Envelope
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err = rlp.DecodeBytes(i.Value(), &envelope)
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if err != nil {
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glog.V(logger.Error).Infof("RLP decoding failed: %s", err)
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}
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if topic == empty || envelope.Topic == topic {
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err = s.w.SendP2PDirect(peer, &envelope)
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if err != nil {
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glog.V(logger.Error).Infof("Failed to send direct message to peer: %s", err)
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return
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}
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}
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}
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err = i.Error()
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if err != nil {
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glog.V(logger.Error).Infof("Level DB iterator error: %s", err)
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}
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}
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func (s *WMailServer) validate(peer *whisper.Peer, request *whisper.Envelope) (bool, uint32, uint32, whisper.TopicType) {
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var topic whisper.TopicType
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if s.pow > 0.0 && request.PoW() < s.pow {
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return false, 0, 0, topic
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}
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f := whisper.Filter{KeySym: s.key}
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decrypted := request.Open(&f)
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if decrypted == nil {
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glog.V(logger.Warn).Infof("Failed to decrypt p2p request")
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return false, 0, 0, topic
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}
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if len(decrypted.Payload) < 8 {
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glog.V(logger.Warn).Infof("Undersized p2p request")
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return false, 0, 0, topic
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}
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if bytes.Equal(peer.ID(), decrypted.Signature) {
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glog.V(logger.Warn).Infof("Wrong signature of p2p request")
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return false, 0, 0, topic
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}
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lower := binary.BigEndian.Uint32(decrypted.Payload[:4])
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upper := binary.BigEndian.Uint32(decrypted.Payload[4:8])
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if len(decrypted.Payload) >= 8+whisper.TopicLength {
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topic = whisper.BytesToTopic(decrypted.Payload[8:])
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}
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return true, lower, upper, topic
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}
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