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

whisper/mailserver/mailserver.go

+// 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
+}

whisper/shhapi/api.go

@@ -93,12 +93,12 @@ func (api *PublicWhisperAPI) MarkPeerTrusted(peerID hexutil.Bytes) error {
 // data contains parameters (time frame, payment details, etc.), required
 // by the remote email-like server. Whisper is not aware about the data format,
 // it will just forward the raw data to the server.
-func (api *PublicWhisperAPI) RequestHistoricMessages(peerID hexutil.Bytes, data hexutil.Bytes) error {
-	if api.whisper == nil {
-		return whisperOffLineErr
-	}
-	return api.whisper.RequestHistoricMessages(peerID, data)
-}
+//func (api *PublicWhisperAPI) RequestHistoricMessages(peerID hexutil.Bytes, data hexutil.Bytes) error {
+//	if api.whisper == nil {
+//		return whisperOffLineErr
+//	}
+//	return api.whisper.RequestHistoricMessages(peerID, data)
+//}
 
 // HasIdentity checks if the whisper node is configured with the private key
 // of the specified public pair.

whisper/whisperv5/doc.go

@@ -83,5 +83,5 @@ func (e unknownVersionError) Error() string {
 // in order to bypass the expiry checks.
 type MailServer interface {
 	Archive(env *Envelope)
-	DeliverMail(whisperPeer *Peer, data []byte)
+	DeliverMail(whisperPeer *Peer, request *Envelope)
 }

whisper/whisperv5/message_test.go

@@ -22,6 +22,7 @@ import (
 	"testing"
 
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rlp"
 )
 
 func copyFromBuf(dst []byte, src []byte, beg int) int {
@@ -311,3 +312,35 @@ func TestEncryptWithZeroKey(t *testing.T) {
 		t.Fatalf("wrapped with nil key, seed: %d.", seed)
 	}
 }
+
+func TestRlpEncode(t *testing.T) {
+	InitSingleTest()
+
+	params, err := generateMessageParams()
+	if err != nil {
+		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
+	}
+	msg := NewSentMessage(params)
+	env, err := msg.Wrap(params)
+	if err != nil {
+		t.Fatalf("wrapped with zero key, seed: %d.", seed)
+	}
+
+	raw, err := rlp.EncodeToBytes(env)
+	if err != nil {
+		t.Fatalf("RLP encode failed: %s.", err)
+	}
+
+	var decoded Envelope
+	rlp.DecodeBytes(raw, &decoded)
+	if err != nil {
+		t.Fatalf("RLP decode failed: %s.", err)
+	}
+
+	he := env.Hash()
+	hd := decoded.Hash()
+
+	if he != hd {
+		t.Fatalf("Hashes are not equal: %x vs. %x", he, hd)
+	}
+}

whisper/whisperv5/peer.go

@@ -175,3 +175,8 @@ func (p *Peer) broadcast() error {
 	glog.V(logger.Detail).Infoln(p.peer, "broadcasted", len(transmit), "message(s)")
 	return nil
 }
+
+func (p *Peer) ID() []byte {
+	id := p.peer.ID()
+	return id[:]
+}

whisper/whisperv5/whisper.go

@@ -31,7 +31,6 @@ import (
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/p2p"
-	"github.com/ethereum/go-ethereum/rlp"
 	"golang.org/x/crypto/pbkdf2"
 	set "gopkg.in/fatih/set.v0"
 )
@@ -125,13 +124,13 @@ func (w *Whisper) MarkPeerTrusted(peerID []byte) error {
 	return nil
 }
 
-func (w *Whisper) RequestHistoricMessages(peerID []byte, data []byte) error {
+func (w *Whisper) RequestHistoricMessages(peerID []byte, envelope *Envelope) error {
 	p, err := w.getPeer(peerID)
 	if err != nil {
 		return err
 	}
 	p.trusted = true
-	return p2p.Send(p.ws, p2pRequestCode, data)
+	return p2p.Send(p.ws, p2pRequestCode, envelope)
 }
 
 func (w *Whisper) SendP2PMessage(peerID []byte, envelope *Envelope) error {
@@ -142,6 +141,10 @@ func (w *Whisper) SendP2PMessage(peerID []byte, envelope *Envelope) error {
 	return p2p.Send(p.ws, p2pCode, envelope)
 }
 
+func (w *Whisper) SendP2PDirect(peer *Peer, envelope *Envelope) error {
+	return p2p.Send(peer.ws, p2pCode, envelope)
+}
+
 // NewIdentity generates a new cryptographic identity for the client, and injects
 // it into the known identities for message decryption.
 func (w *Whisper) NewIdentity() *ecdsa.PrivateKey {
@@ -347,9 +350,6 @@ func (wh *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 					return fmt.Errorf("invalid envelope")
 				}
 				p.mark(envelope)
-				if wh.mailServer != nil {
-					wh.mailServer.Archive(envelope)
-				}
 			}
 		case p2pCode:
 			// peer-to-peer message, sent directly to peer bypassing PoW checks, etc.
@@ -357,25 +357,22 @@ func (wh *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 			// therefore might not satisfy the PoW, expiry and other requirements.
 			// these messages are only accepted from the trusted peer.
 			if p.trusted {
-				var envelopes []*Envelope
-				if err := packet.Decode(&envelopes); err != nil {
+				var envelope Envelope
+				if err := packet.Decode(&envelope); err != nil {
 					glog.V(logger.Warn).Infof("%v: failed to decode direct message: [%v], peer will be disconnected", p.peer, err)
 					return fmt.Errorf("garbage received (directMessage)")
 				}
-				for _, envelope := range envelopes {
-					wh.postEvent(envelope, true)
-				}
+				wh.postEvent(&envelope, true)
 			}
 		case p2pRequestCode:
 			// Must be processed if mail server is implemented. Otherwise ignore.
 			if wh.mailServer != nil {
-				s := rlp.NewStream(packet.Payload, uint64(packet.Size))
-				data, err := s.Bytes()
-				if err == nil {
-					wh.mailServer.DeliverMail(p, data)
-				} else {
-					glog.V(logger.Error).Infof("%v: bad requestHistoricMessages received: [%v]", p.peer, err)
+				var request Envelope
+				if err := packet.Decode(&request); err != nil {
+					glog.V(logger.Warn).Infof("%v: failed to decode p2p request message: [%v], peer will be disconnected", p.peer, err)
+					return fmt.Errorf("garbage received (p2p request)")
 				}
+				wh.mailServer.DeliverMail(p, &request)
 			}
 		default:
 			// New message types might be implemented in the future versions of Whisper.
@@ -454,6 +451,9 @@ func (wh *Whisper) add(envelope *Envelope) error {
 	} else {
 		glog.V(logger.Detail).Infof("cached whisper envelope [%x]: %v\n", envelope.Hash(), envelope)
 		wh.postEvent(envelope, false) // notify the local node about the new message
+		if wh.mailServer != nil {
+			wh.mailServer.Archive(envelope)
+		}
 	}
 	return nil
 }

whisper/whisperv5/whisper_test.go

@@ -57,12 +57,6 @@ func TestWhisperBasic(t *testing.T) {
 	if err := w.MarkPeerTrusted(peerID); err == nil {
 		t.Fatalf("failed MarkPeerTrusted.")
 	}
-	if err := w.RequestHistoricMessages(peerID, peerID); err == nil {
-		t.Fatalf("failed RequestHistoricMessages.")
-	}
-	if err := w.SendP2PMessage(peerID, nil); err == nil {
-		t.Fatalf("failed SendP2PMessage.")
-	}
 	exist := w.HasSymKey("non-existing")
 	if exist {
 		t.Fatalf("failed HasSymKey.")