cmd/wnode, whisper: add whisper CLI tool and mail server (#3580)

whisper/mailserver/mailserver.go

@@ -0,0 +1,170 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package mailserver
+
+import (
+	"bytes"
+	"encoding/binary"
+
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/rlp"
+	whisper "github.com/ethereum/go-ethereum/whisper/whisperv5"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+const MailServerKeyName = "958e04ab302fb36ad2616a352cbac79d"
+
+type WMailServer struct {
+	db  *leveldb.DB
+	w   *whisper.Whisper
+	pow float64
+	key []byte
+}
+
+type DBKey struct {
+	timestamp uint32
+	hash      common.Hash
+	raw       []byte
+}
+
+func NewDbKey(t uint32, h common.Hash) *DBKey {
+	const sz = common.HashLength + 4
+	var k DBKey
+	k.timestamp = t
+	k.hash = h
+	k.raw = make([]byte, sz)
+	binary.BigEndian.PutUint32(k.raw, k.timestamp)
+	copy(k.raw[4:], k.hash[:])
+	return &k
+}
+
+func (s *WMailServer) Init(shh *whisper.Whisper, path string, password string, pow float64) {
+	var err error
+	if len(path) == 0 {
+		utils.Fatalf("DB file is not specified")
+	}
+
+	if len(password) == 0 {
+		utils.Fatalf("Password is not specified for MailServer")
+	}
+
+	s.db, err = leveldb.OpenFile(path, nil)
+	if err != nil {
+		utils.Fatalf("Failed to open DB file: %s", err)
+	}
+
+	s.w = shh
+	s.pow = pow
+
+	err = s.w.AddSymKey(MailServerKeyName, []byte(password))
+	if err != nil {
+		utils.Fatalf("Failed to create symmetric key for MailServer: %s", err)
+	}
+	s.key = s.w.GetSymKey(MailServerKeyName)
+}
+
+func (s *WMailServer) Close() {
+	if s.db != nil {
+		s.db.Close()
+	}
+}
+
+func (s *WMailServer) Archive(env *whisper.Envelope) {
+	key := NewDbKey(env.Expiry-env.TTL, env.Hash())
+	rawEnvelope, err := rlp.EncodeToBytes(env)
+	if err != nil {
+		glog.V(logger.Error).Infof("rlp.EncodeToBytes failed: %s", err)
+	} else {
+		err = s.db.Put(key.raw, rawEnvelope, nil)
+		if err != nil {
+			glog.V(logger.Error).Infof("Writing to DB failed: %s", err)
+		}
+	}
+}
+
+func (s *WMailServer) DeliverMail(peer *whisper.Peer, request *whisper.Envelope) {
+	ok, lower, upper, topic := s.validate(peer, request)
+	if !ok {
+		return
+	}
+
+	var err error
+	var zero common.Hash
+	var empty whisper.TopicType
+	kl := NewDbKey(lower, zero)
+	ku := NewDbKey(upper, zero)
+	i := s.db.NewIterator(&util.Range{Start: kl.raw, Limit: ku.raw}, nil)
+	defer i.Release()
+
+	for i.Next() {
+		var envelope whisper.Envelope
+		err = rlp.DecodeBytes(i.Value(), &envelope)
+		if err != nil {
+			glog.V(logger.Error).Infof("RLP decoding failed: %s", err)
+		}
+
+		if topic == empty || envelope.Topic == topic {
+			err = s.w.SendP2PDirect(peer, &envelope)
+			if err != nil {
+				glog.V(logger.Error).Infof("Failed to send direct message to peer: %s", err)
+				return
+			}
+		}
+	}
+
+	err = i.Error()
+	if err != nil {
+		glog.V(logger.Error).Infof("Level DB iterator error: %s", err)
+	}
+}
+
+func (s *WMailServer) validate(peer *whisper.Peer, request *whisper.Envelope) (bool, uint32, uint32, whisper.TopicType) {
+	var topic whisper.TopicType
+	if s.pow > 0.0 && request.PoW() < s.pow {
+		return false, 0, 0, topic
+	}
+
+	f := whisper.Filter{KeySym: s.key}
+	decrypted := request.Open(&f)
+	if decrypted == nil {
+		glog.V(logger.Warn).Infof("Failed to decrypt p2p request")
+		return false, 0, 0, topic
+	}
+
+	if len(decrypted.Payload) < 8 {
+		glog.V(logger.Warn).Infof("Undersized p2p request")
+		return false, 0, 0, topic
+	}
+
+	if bytes.Equal(peer.ID(), decrypted.Signature) {
+		glog.V(logger.Warn).Infof("Wrong signature of p2p request")
+		return false, 0, 0, topic
+	}
+
+	lower := binary.BigEndian.Uint32(decrypted.Payload[:4])
+	upper := binary.BigEndian.Uint32(decrypted.Payload[4:8])
+
+	if len(decrypted.Payload) >= 8+whisper.TopicLength {
+		topic = whisper.BytesToTopic(decrypted.Payload[8:])
+	}
+
+	return true, lower, upper, topic
+}