plugeth/cmd/wnode/main.go
Felix Lange 30cd5c1854
all: new p2p node representation (#17643)
Package p2p/enode provides a generalized representation of p2p nodes
which can contain arbitrary information in key/value pairs. It is also
the new home for the node database. The "v4" identity scheme is also
moved here from p2p/enr to remove the dependency on Ethereum crypto from
that package.

Record signature handling is changed significantly. The identity scheme
registry is removed and acceptable schemes must be passed to any method
that needs identity. This means records must now be validated explicitly
after decoding.

The enode API is designed to make signature handling easy and safe: most
APIs around the codebase work with enode.Node, which is a wrapper around
a valid record. Going from enr.Record to enode.Node requires a valid
signature.

* p2p/discover: port to p2p/enode

This ports the discovery code to the new node representation in
p2p/enode. The wire protocol is unchanged, this can be considered a
refactoring change. The Kademlia table can now deal with nodes using an
arbitrary identity scheme. This requires a few incompatible API changes:

  - Table.Lookup is not available anymore. It used to take a public key
    as argument because v4 protocol requires one. Its replacement is
    LookupRandom.
  - Table.Resolve takes *enode.Node instead of NodeID. This is also for
    v4 protocol compatibility because nodes cannot be looked up by ID
    alone.
  - Types Node and NodeID are gone. Further commits in the series will be
    fixes all over the the codebase to deal with those removals.

* p2p: port to p2p/enode and discovery changes

This adapts package p2p to the changes in p2p/discover. All uses of
discover.Node and discover.NodeID are replaced by their equivalents from
p2p/enode.

New API is added to retrieve the enode.Node instance of a peer. The
behavior of Server.Self with discovery disabled is improved. It now
tries much harder to report a working IP address, falling back to
127.0.0.1 if no suitable address can be determined through other means.
These changes were needed for tests of other packages later in the
series.

* p2p/simulations, p2p/testing: port to p2p/enode

No surprises here, mostly replacements of discover.Node, discover.NodeID
with their new equivalents. The 'interesting' API changes are:

 - testing.ProtocolSession tracks complete nodes, not just their IDs.
 - adapters.NodeConfig has a new method to create a complete node.

These changes were needed to make swarm tests work.

Note that the NodeID change makes the code incompatible with old
simulation snapshots.

* whisper/whisperv5, whisper/whisperv6: port to p2p/enode

This port was easy because whisper uses []byte for node IDs and
URL strings in the API.

* eth: port to p2p/enode

Again, easy to port because eth uses strings for node IDs and doesn't
care about node information in any way.

* les: port to p2p/enode

Apart from replacing discover.NodeID with enode.ID, most changes are in
the server pool code. It now deals with complete nodes instead
of (Pubkey, IP, Port) triples. The database format is unchanged for now,
but we should probably change it to use the node database later.

* node: port to p2p/enode

This change simply replaces discover.Node and discover.NodeID with their
new equivalents.

* swarm/network: port to p2p/enode

Swarm has its own node address representation, BzzAddr, containing both
an overlay address (the hash of a secp256k1 public key) and an underlay
address (enode:// URL).

There are no changes to the BzzAddr format in this commit, but certain
operations such as creating a BzzAddr from a node ID are now impossible
because node IDs aren't public keys anymore.

Most swarm-related changes in the series remove uses of
NewAddrFromNodeID, replacing it with NewAddr which takes a complete node
as argument. ToOverlayAddr is removed because we can just use the node
ID directly.
2018-09-25 00:59:00 +02:00

773 lines
20 KiB
Go

// Copyright 2017 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/>.
// This is a simple Whisper node. It could be used as a stand-alone bootstrap node.
// Also, could be used for different test and diagnostics purposes.
package main
import (
"bufio"
"crypto/ecdsa"
crand "crypto/rand"
"crypto/sha512"
"encoding/binary"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/console"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/whisper/mailserver"
whisper "github.com/ethereum/go-ethereum/whisper/whisperv6"
"golang.org/x/crypto/pbkdf2"
)
const quitCommand = "~Q"
const entropySize = 32
// singletons
var (
server *p2p.Server
shh *whisper.Whisper
done chan struct{}
mailServer mailserver.WMailServer
entropy [entropySize]byte
input = bufio.NewReader(os.Stdin)
)
// encryption
var (
symKey []byte
pub *ecdsa.PublicKey
asymKey *ecdsa.PrivateKey
nodeid *ecdsa.PrivateKey
topic whisper.TopicType
asymKeyID string
asymFilterID string
symFilterID string
symPass string
msPassword string
)
// cmd arguments
var (
bootstrapMode = flag.Bool("standalone", false, "boostrap node: don't initiate connection to peers, just wait for incoming connections")
forwarderMode = flag.Bool("forwarder", false, "forwarder mode: only forward messages, neither encrypt nor decrypt messages")
mailServerMode = flag.Bool("mailserver", false, "mail server mode: delivers expired messages on demand")
requestMail = flag.Bool("mailclient", false, "request expired messages from the bootstrap server")
asymmetricMode = flag.Bool("asym", false, "use asymmetric encryption")
generateKey = flag.Bool("generatekey", false, "generate and show the private key")
fileExMode = flag.Bool("fileexchange", false, "file exchange mode")
fileReader = flag.Bool("filereader", false, "load and decrypt messages saved as files, display as plain text")
testMode = flag.Bool("test", false, "use of predefined parameters for diagnostics (password, etc.)")
echoMode = flag.Bool("echo", false, "echo mode: prints some arguments for diagnostics")
argVerbosity = flag.Int("verbosity", int(log.LvlError), "log verbosity level")
argTTL = flag.Uint("ttl", 30, "time-to-live for messages in seconds")
argWorkTime = flag.Uint("work", 5, "work time in seconds")
argMaxSize = flag.Uint("maxsize", uint(whisper.DefaultMaxMessageSize), "max size of message")
argPoW = flag.Float64("pow", whisper.DefaultMinimumPoW, "PoW for normal messages in float format (e.g. 2.7)")
argServerPoW = flag.Float64("mspow", whisper.DefaultMinimumPoW, "PoW requirement for Mail Server request")
argIP = flag.String("ip", "", "IP address and port of this node (e.g. 127.0.0.1:30303)")
argPub = flag.String("pub", "", "public key for asymmetric encryption")
argDBPath = flag.String("dbpath", "", "path to the server's DB directory")
argIDFile = flag.String("idfile", "", "file name with node id (private key)")
argEnode = flag.String("boot", "", "bootstrap node you want to connect to (e.g. enode://e454......08d50@52.176.211.200:16428)")
argTopic = flag.String("topic", "", "topic in hexadecimal format (e.g. 70a4beef)")
argSaveDir = flag.String("savedir", "", "directory where all incoming messages will be saved as files")
)
func main() {
processArgs()
initialize()
run()
shutdown()
}
func processArgs() {
flag.Parse()
if len(*argIDFile) > 0 {
var err error
nodeid, err = crypto.LoadECDSA(*argIDFile)
if err != nil {
utils.Fatalf("Failed to load file [%s]: %s.", *argIDFile, err)
}
}
const enodePrefix = "enode://"
if len(*argEnode) > 0 {
if (*argEnode)[:len(enodePrefix)] != enodePrefix {
*argEnode = enodePrefix + *argEnode
}
}
if len(*argTopic) > 0 {
x, err := hex.DecodeString(*argTopic)
if err != nil {
utils.Fatalf("Failed to parse the topic: %s", err)
}
topic = whisper.BytesToTopic(x)
}
if *asymmetricMode && len(*argPub) > 0 {
var err error
if pub, err = crypto.UnmarshalPubkey(common.FromHex(*argPub)); err != nil {
utils.Fatalf("invalid public key")
}
}
if len(*argSaveDir) > 0 {
if _, err := os.Stat(*argSaveDir); os.IsNotExist(err) {
utils.Fatalf("Download directory '%s' does not exist", *argSaveDir)
}
} else if *fileExMode {
utils.Fatalf("Parameter 'savedir' is mandatory for file exchange mode")
}
if *echoMode {
echo()
}
}
func echo() {
fmt.Printf("ttl = %d \n", *argTTL)
fmt.Printf("workTime = %d \n", *argWorkTime)
fmt.Printf("pow = %f \n", *argPoW)
fmt.Printf("mspow = %f \n", *argServerPoW)
fmt.Printf("ip = %s \n", *argIP)
fmt.Printf("pub = %s \n", common.ToHex(crypto.FromECDSAPub(pub)))
fmt.Printf("idfile = %s \n", *argIDFile)
fmt.Printf("dbpath = %s \n", *argDBPath)
fmt.Printf("boot = %s \n", *argEnode)
}
func initialize() {
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(*argVerbosity), log.StreamHandler(os.Stderr, log.TerminalFormat(false))))
done = make(chan struct{})
var peers []*enode.Node
var err error
if *generateKey {
key, err := crypto.GenerateKey()
if err != nil {
utils.Fatalf("Failed to generate private key: %s", err)
}
k := hex.EncodeToString(crypto.FromECDSA(key))
fmt.Printf("Random private key: %s \n", k)
os.Exit(0)
}
if *testMode {
symPass = "wwww" // ascii code: 0x77777777
msPassword = "wwww"
}
if *bootstrapMode {
if len(*argIP) == 0 {
argIP = scanLineA("Please enter your IP and port (e.g. 127.0.0.1:30348): ")
}
} else if *fileReader {
*bootstrapMode = true
} else {
if len(*argEnode) == 0 {
argEnode = scanLineA("Please enter the peer's enode: ")
}
peer := enode.MustParseV4(*argEnode)
peers = append(peers, peer)
}
if *mailServerMode {
if len(msPassword) == 0 {
msPassword, err = console.Stdin.PromptPassword("Please enter the Mail Server password: ")
if err != nil {
utils.Fatalf("Failed to read Mail Server password: %s", err)
}
}
}
cfg := &whisper.Config{
MaxMessageSize: uint32(*argMaxSize),
MinimumAcceptedPOW: *argPoW,
}
shh = whisper.New(cfg)
if *argPoW != whisper.DefaultMinimumPoW {
err := shh.SetMinimumPoW(*argPoW)
if err != nil {
utils.Fatalf("Failed to set PoW: %s", err)
}
}
if uint32(*argMaxSize) != whisper.DefaultMaxMessageSize {
err := shh.SetMaxMessageSize(uint32(*argMaxSize))
if err != nil {
utils.Fatalf("Failed to set max message size: %s", err)
}
}
asymKeyID, err = shh.NewKeyPair()
if err != nil {
utils.Fatalf("Failed to generate a new key pair: %s", err)
}
asymKey, err = shh.GetPrivateKey(asymKeyID)
if err != nil {
utils.Fatalf("Failed to retrieve a new key pair: %s", err)
}
if nodeid == nil {
tmpID, err := shh.NewKeyPair()
if err != nil {
utils.Fatalf("Failed to generate a new key pair: %s", err)
}
nodeid, err = shh.GetPrivateKey(tmpID)
if err != nil {
utils.Fatalf("Failed to retrieve a new key pair: %s", err)
}
}
maxPeers := 80
if *bootstrapMode {
maxPeers = 800
}
_, err = crand.Read(entropy[:])
if err != nil {
utils.Fatalf("crypto/rand failed: %s", err)
}
if *mailServerMode {
shh.RegisterServer(&mailServer)
if err := mailServer.Init(shh, *argDBPath, msPassword, *argServerPoW); err != nil {
utils.Fatalf("Failed to init MailServer: %s", err)
}
}
server = &p2p.Server{
Config: p2p.Config{
PrivateKey: nodeid,
MaxPeers: maxPeers,
Name: common.MakeName("wnode", "6.0"),
Protocols: shh.Protocols(),
ListenAddr: *argIP,
NAT: nat.Any(),
BootstrapNodes: peers,
StaticNodes: peers,
TrustedNodes: peers,
},
}
}
func startServer() error {
err := server.Start()
if err != nil {
fmt.Printf("Failed to start Whisper peer: %s.", err)
return err
}
fmt.Printf("my public key: %s \n", common.ToHex(crypto.FromECDSAPub(&asymKey.PublicKey)))
fmt.Println(server.NodeInfo().Enode)
if *bootstrapMode {
configureNode()
fmt.Println("Bootstrap Whisper node started")
} else {
fmt.Println("Whisper node started")
// first see if we can establish connection, then ask for user input
waitForConnection(true)
configureNode()
}
if *fileExMode {
fmt.Printf("Please type the file name to be send. To quit type: '%s'\n", quitCommand)
} else if *fileReader {
fmt.Printf("Please type the file name to be decrypted. To quit type: '%s'\n", quitCommand)
} else if !*forwarderMode {
fmt.Printf("Please type the message. To quit type: '%s'\n", quitCommand)
}
return nil
}
func configureNode() {
var err error
var p2pAccept bool
if *forwarderMode {
return
}
if *asymmetricMode {
if len(*argPub) == 0 {
s := scanLine("Please enter the peer's public key: ")
b := common.FromHex(s)
if b == nil {
utils.Fatalf("Error: can not convert hexadecimal string")
}
if pub, err = crypto.UnmarshalPubkey(b); err != nil {
utils.Fatalf("Error: invalid peer public key")
}
}
}
if *requestMail {
p2pAccept = true
if len(msPassword) == 0 {
msPassword, err = console.Stdin.PromptPassword("Please enter the Mail Server password: ")
if err != nil {
utils.Fatalf("Failed to read Mail Server password: %s", err)
}
}
}
if !*asymmetricMode && !*forwarderMode {
if len(symPass) == 0 {
symPass, err = console.Stdin.PromptPassword("Please enter the password for symmetric encryption: ")
if err != nil {
utils.Fatalf("Failed to read passphrase: %v", err)
}
}
symKeyID, err := shh.AddSymKeyFromPassword(symPass)
if err != nil {
utils.Fatalf("Failed to create symmetric key: %s", err)
}
symKey, err = shh.GetSymKey(symKeyID)
if err != nil {
utils.Fatalf("Failed to save symmetric key: %s", err)
}
if len(*argTopic) == 0 {
generateTopic([]byte(symPass))
}
fmt.Printf("Filter is configured for the topic: %x \n", topic)
}
if *mailServerMode {
if len(*argDBPath) == 0 {
argDBPath = scanLineA("Please enter the path to DB file: ")
}
}
symFilter := whisper.Filter{
KeySym: symKey,
Topics: [][]byte{topic[:]},
AllowP2P: p2pAccept,
}
symFilterID, err = shh.Subscribe(&symFilter)
if err != nil {
utils.Fatalf("Failed to install filter: %s", err)
}
asymFilter := whisper.Filter{
KeyAsym: asymKey,
Topics: [][]byte{topic[:]},
AllowP2P: p2pAccept,
}
asymFilterID, err = shh.Subscribe(&asymFilter)
if err != nil {
utils.Fatalf("Failed to install filter: %s", err)
}
}
func generateTopic(password []byte) {
x := pbkdf2.Key(password, password, 4096, 128, sha512.New)
for i := 0; i < len(x); i++ {
topic[i%whisper.TopicLength] ^= x[i]
}
}
func waitForConnection(timeout bool) {
var cnt int
var connected bool
for !connected {
time.Sleep(time.Millisecond * 50)
connected = server.PeerCount() > 0
if timeout {
cnt++
if cnt > 1000 {
utils.Fatalf("Timeout expired, failed to connect")
}
}
}
fmt.Println("Connected to peer.")
}
func run() {
err := startServer()
if err != nil {
return
}
defer server.Stop()
shh.Start(nil)
defer shh.Stop()
if !*forwarderMode {
go messageLoop()
}
if *requestMail {
requestExpiredMessagesLoop()
} else if *fileExMode {
sendFilesLoop()
} else if *fileReader {
fileReaderLoop()
} else {
sendLoop()
}
}
func shutdown() {
close(done)
mailServer.Close()
}
func sendLoop() {
for {
s := scanLine("")
if s == quitCommand {
fmt.Println("Quit command received")
return
}
sendMsg([]byte(s))
if *asymmetricMode {
// print your own message for convenience,
// because in asymmetric mode it is impossible to decrypt it
timestamp := time.Now().Unix()
from := crypto.PubkeyToAddress(asymKey.PublicKey)
fmt.Printf("\n%d <%x>: %s\n", timestamp, from, s)
}
}
}
func sendFilesLoop() {
for {
s := scanLine("")
if s == quitCommand {
fmt.Println("Quit command received")
return
}
b, err := ioutil.ReadFile(s)
if err != nil {
fmt.Printf(">>> Error: %s \n", err)
} else {
h := sendMsg(b)
if (h == common.Hash{}) {
fmt.Printf(">>> Error: message was not sent \n")
} else {
timestamp := time.Now().Unix()
from := crypto.PubkeyToAddress(asymKey.PublicKey)
fmt.Printf("\n%d <%x>: sent message with hash %x\n", timestamp, from, h)
}
}
}
}
func fileReaderLoop() {
watcher1 := shh.GetFilter(symFilterID)
watcher2 := shh.GetFilter(asymFilterID)
if watcher1 == nil && watcher2 == nil {
fmt.Println("Error: neither symmetric nor asymmetric filter is installed")
return
}
for {
s := scanLine("")
if s == quitCommand {
fmt.Println("Quit command received")
return
}
raw, err := ioutil.ReadFile(s)
if err != nil {
fmt.Printf(">>> Error: %s \n", err)
} else {
env := whisper.Envelope{Data: raw} // the topic is zero
msg := env.Open(watcher1) // force-open envelope regardless of the topic
if msg == nil {
msg = env.Open(watcher2)
}
if msg == nil {
fmt.Printf(">>> Error: failed to decrypt the message \n")
} else {
printMessageInfo(msg)
}
}
}
}
func scanLine(prompt string) string {
if len(prompt) > 0 {
fmt.Print(prompt)
}
txt, err := input.ReadString('\n')
if err != nil {
utils.Fatalf("input error: %s", err)
}
txt = strings.TrimRight(txt, "\n\r")
return txt
}
func scanLineA(prompt string) *string {
s := scanLine(prompt)
return &s
}
func scanUint(prompt string) uint32 {
s := scanLine(prompt)
i, err := strconv.Atoi(s)
if err != nil {
utils.Fatalf("Fail to parse the lower time limit: %s", err)
}
return uint32(i)
}
func sendMsg(payload []byte) common.Hash {
params := whisper.MessageParams{
Src: asymKey,
Dst: pub,
KeySym: symKey,
Payload: payload,
Topic: topic,
TTL: uint32(*argTTL),
PoW: *argPoW,
WorkTime: uint32(*argWorkTime),
}
msg, err := whisper.NewSentMessage(&params)
if err != nil {
utils.Fatalf("failed to create new message: %s", err)
}
envelope, err := msg.Wrap(&params)
if err != nil {
fmt.Printf("failed to seal message: %v \n", err)
return common.Hash{}
}
err = shh.Send(envelope)
if err != nil {
fmt.Printf("failed to send message: %v \n", err)
return common.Hash{}
}
return envelope.Hash()
}
func messageLoop() {
sf := shh.GetFilter(symFilterID)
if sf == nil {
utils.Fatalf("symmetric filter is not installed")
}
af := shh.GetFilter(asymFilterID)
if af == nil {
utils.Fatalf("asymmetric filter is not installed")
}
ticker := time.NewTicker(time.Millisecond * 50)
for {
select {
case <-ticker.C:
m1 := sf.Retrieve()
m2 := af.Retrieve()
messages := append(m1, m2...)
for _, msg := range messages {
reportedOnce := false
if !*fileExMode && len(msg.Payload) <= 2048 {
printMessageInfo(msg)
reportedOnce = true
}
// All messages are saved upon specifying argSaveDir.
// fileExMode only specifies how messages are displayed on the console after they are saved.
// if fileExMode == true, only the hashes are displayed, since messages might be too big.
if len(*argSaveDir) > 0 {
writeMessageToFile(*argSaveDir, msg, !reportedOnce)
}
}
case <-done:
return
}
}
}
func printMessageInfo(msg *whisper.ReceivedMessage) {
timestamp := fmt.Sprintf("%d", msg.Sent) // unix timestamp for diagnostics
text := string(msg.Payload)
var address common.Address
if msg.Src != nil {
address = crypto.PubkeyToAddress(*msg.Src)
}
if whisper.IsPubKeyEqual(msg.Src, &asymKey.PublicKey) {
fmt.Printf("\n%s <%x>: %s\n", timestamp, address, text) // message from myself
} else {
fmt.Printf("\n%s [%x]: %s\n", timestamp, address, text) // message from a peer
}
}
func writeMessageToFile(dir string, msg *whisper.ReceivedMessage, show bool) {
if len(dir) == 0 {
return
}
timestamp := fmt.Sprintf("%d", msg.Sent)
name := fmt.Sprintf("%x", msg.EnvelopeHash)
var address common.Address
if msg.Src != nil {
address = crypto.PubkeyToAddress(*msg.Src)
}
env := shh.GetEnvelope(msg.EnvelopeHash)
if env == nil {
fmt.Printf("\nUnexpected error: envelope not found: %x\n", msg.EnvelopeHash)
return
}
// this is a sample code; uncomment if you don't want to save your own messages.
//if whisper.IsPubKeyEqual(msg.Src, &asymKey.PublicKey) {
// fmt.Printf("\n%s <%x>: message from myself received, not saved: '%s'\n", timestamp, address, name)
// return
//}
fullpath := filepath.Join(dir, name)
err := ioutil.WriteFile(fullpath, env.Data, 0644)
if err != nil {
fmt.Printf("\n%s {%x}: message received but not saved: %s\n", timestamp, address, err)
} else if show {
fmt.Printf("\n%s {%x}: message received and saved as '%s' (%d bytes)\n", timestamp, address, name, len(env.Data))
}
}
func requestExpiredMessagesLoop() {
var key, peerID, bloom []byte
var timeLow, timeUpp uint32
var t string
var xt whisper.TopicType
keyID, err := shh.AddSymKeyFromPassword(msPassword)
if err != nil {
utils.Fatalf("Failed to create symmetric key for mail request: %s", err)
}
key, err = shh.GetSymKey(keyID)
if err != nil {
utils.Fatalf("Failed to save symmetric key for mail request: %s", err)
}
peerID = extractIDFromEnode(*argEnode)
shh.AllowP2PMessagesFromPeer(peerID)
for {
timeLow = scanUint("Please enter the lower limit of the time range (unix timestamp): ")
timeUpp = scanUint("Please enter the upper limit of the time range (unix timestamp): ")
t = scanLine("Enter the topic (hex). Press enter to request all messages, regardless of the topic: ")
if len(t) == whisper.TopicLength*2 {
x, err := hex.DecodeString(t)
if err != nil {
fmt.Printf("Failed to parse the topic: %s \n", err)
continue
}
xt = whisper.BytesToTopic(x)
bloom = whisper.TopicToBloom(xt)
obfuscateBloom(bloom)
} else if len(t) == 0 {
bloom = whisper.MakeFullNodeBloom()
} else {
fmt.Println("Error: topic is invalid, request aborted")
continue
}
if timeUpp == 0 {
timeUpp = 0xFFFFFFFF
}
data := make([]byte, 8, 8+whisper.BloomFilterSize)
binary.BigEndian.PutUint32(data, timeLow)
binary.BigEndian.PutUint32(data[4:], timeUpp)
data = append(data, bloom...)
var params whisper.MessageParams
params.PoW = *argServerPoW
params.Payload = data
params.KeySym = key
params.Src = asymKey
params.WorkTime = 5
msg, err := whisper.NewSentMessage(&params)
if err != nil {
utils.Fatalf("failed to create new message: %s", err)
}
env, err := msg.Wrap(&params)
if err != nil {
utils.Fatalf("Wrap failed: %s", err)
}
err = shh.RequestHistoricMessages(peerID, env)
if err != nil {
utils.Fatalf("Failed to send P2P message: %s", err)
}
time.Sleep(time.Second * 5)
}
}
func extractIDFromEnode(s string) []byte {
n, err := enode.ParseV4(s)
if err != nil {
utils.Fatalf("Failed to parse enode: %s", err)
}
return n.ID().Bytes()
}
// obfuscateBloom adds 16 random bits to the bloom
// filter, in order to obfuscate the containing topics.
// it does so deterministically within every session.
// despite additional bits, it will match on average
// 32000 times less messages than full node's bloom filter.
func obfuscateBloom(bloom []byte) {
const half = entropySize / 2
for i := 0; i < half; i++ {
x := int(entropy[i])
if entropy[half+i] < 128 {
x += 256
}
bloom[x/8] = 1 << uint(x%8) // set the bit number X
}
}