func (dht *IpfsDHT) handleFindPeer(ctx context.Context, p peer.ID, pmes *pb.Message) (*pb.Message, error) {
defer log.EventBegin(ctx, "handleFindPeer", p).Done()
resp := pb.NewMessage(pmes.GetType(), "", pmes.GetClusterLevel())
var closest []peer.ID
// if looking for self... special case where we send it on CloserPeers.
if peer.ID(pmes.GetKey()) == dht.self {
closest = []peer.ID{dht.self}
} else {
closest = dht.betterPeersToQuery(pmes, p, CloserPeerCount)
}
if closest == nil {
log.Infof("%s handleFindPeer %s: could not find anything.", dht.self, p)
return resp, nil
}
var withAddresses []peer.PeerInfo
closestinfos := peer.PeerInfos(dht.peerstore, closest)
for _, pi := range closestinfos {
if len(pi.Addrs) > 0 {
withAddresses = append(withAddresses, pi)
log.Debugf("handleFindPeer: sending back '%s'", pi.ID)
}
}
resp.CloserPeers = pb.PeerInfosToPBPeers(dht.host.Network(), withAddresses)
return resp, nil
}
func ReadHeader(r io.Reader) (src, dst peer.ID, err error) {
mhr := mh.NewReader(r)
s, err := mhr.ReadMultihash()
if err != nil {
return "", "", err
}
d, err := mhr.ReadMultihash()
if err != nil {
return "", "", err
}
return peer.ID(s), peer.ID(d), nil
}
func (dht *IpfsDHT) closerPeersSingle(ctx context.Context, key key.Key, p peer.ID) ([]peer.ID, error) {
pmes, err := dht.findPeerSingle(ctx, p, peer.ID(key))
if err != nil {
return nil, err
}
var out []peer.ID
for _, pbp := range pmes.GetCloserPeers() {
pid := peer.ID(pbp.GetId())
if pid != dht.self { // dont add self
dht.peerstore.AddAddrs(pid, pbp.Addresses(), peer.TempAddrTTL)
out = append(out, pid)
}
}
return out, nil
}
// RandPeerID generates random "valid" peer IDs. it does not NEED to generate
// keys because it is as if we lost the key right away. fine to read randomness
// and hash it. to generate proper keys and corresponding PeerID, use:
// sk, pk, _ := testutil.RandKeyPair()
// id, _ := peer.IDFromPublicKey(pk)
func RandPeerID() (peer.ID, error) {
buf := make([]byte, 16)
if _, err := io.ReadFull(u.NewTimeSeededRand(), buf); err != nil {
return "", err
}
h := u.Hash(buf)
return peer.ID(h), nil
}
// ID returns the ID of a given Conn.
func ID(c Conn) string {
l := fmt.Sprintf("%s/%s", c.LocalMultiaddr(), c.LocalPeer().Pretty())
r := fmt.Sprintf("%s/%s", c.RemoteMultiaddr(), c.RemotePeer().Pretty())
lh := u.Hash([]byte(l))
rh := u.Hash([]byte(r))
ch := u.XOR(lh, rh)
return peer.ID(ch).Pretty()
}
func GetGraphJson(dinfo []*DiagInfo) []byte {
out := make(map[string]interface{})
names := make(map[string]int)
var nodes []*node
for _, di := range dinfo {
names[di.ID] = len(nodes)
val := di.BwIn + di.BwOut + 10
// include the routing table key, for proper routing table display
rtk := peer.ID(rtable.ConvertPeerID(peer.ID(di.ID))).Pretty()
nodes = append(nodes, &node{Name: di.ID, Value: val, RtKey: rtk})
}
var links []*link
linkexists := make([][]bool, len(nodes))
for i := range linkexists {
linkexists[i] = make([]bool, len(nodes))
}
for _, di := range dinfo {
myid := names[di.ID]
for _, con := range di.Connections {
thisid := names[con.ID]
if !linkexists[thisid][myid] {
links = append(links, &link{
Source: myid,
Target: thisid,
Value: 3,
})
linkexists[myid][thisid] = true
}
}
}
out["nodes"] = nodes
out["links"] = links
b, err := json.Marshal(out)
if err != nil {
panic(err)
}
return b
}
func storeProvidersToPeerstore(ps peer.Peerstore, p peer.ID, providers []*dhtpb.Message_Peer) {
for _, provider := range providers {
providerID := peer.ID(provider.GetId())
if providerID != p {
log.Errorf("provider message came from third-party %s", p)
continue
}
for _, maddr := range provider.Addresses() {
// as a router, we want to store addresses for peers who have provided
ps.AddAddr(p, maddr, peer.AddressTTL)
}
}
}
func GetPublicKey(r IpfsRouting, ctx context.Context, pkhash []byte) (ci.PubKey, error) {
if dht, ok := r.(PubKeyFetcher); ok {
// If we have a DHT as our routing system, use optimized fetcher
return dht.GetPublicKey(ctx, peer.ID(pkhash))
} else {
key := key.Key("/pk/" + string(pkhash))
pkval, err := r.GetValue(ctx, key)
if err != nil {
return nil, err
}
// get PublicKey from node.Data
return ci.UnmarshalPublicKey(pkval)
}
}
func verify(ps peer.Peerstore, r *dhtpb.Record) error {
v := make(record.Validator)
v["pk"] = record.PublicKeyValidator
p := peer.ID(r.GetAuthor())
pk := ps.PubKey(p)
if pk == nil {
return fmt.Errorf("do not have public key for %s", p)
}
if err := record.CheckRecordSig(r, pk); err != nil {
return err
}
if err := v.VerifyRecord(r); err != nil {
return err
}
return nil
}
// verifyRecordLocally attempts to verify a record. if we do not have the public
// key, we fail. we do not search the dht.
func (dht *IpfsDHT) verifyRecordLocally(r *pb.Record) error {
if len(r.Signature) > 0 {
// First, validate the signature
p := peer.ID(r.GetAuthor())
pk := dht.peerstore.PubKey(p)
if pk == nil {
return fmt.Errorf("do not have public key for %s", p)
}
if err := record.CheckRecordSig(r, pk); err != nil {
return err
}
}
return dht.Validator.VerifyRecord(r)
}
// verifyRecordOnline verifies a record, searching the DHT for the public key
// if necessary. The reason there is a distinction in the functions is that
// retrieving arbitrary public keys from the DHT as a result of passively
// receiving records (e.g. through a PUT_VALUE or ADD_PROVIDER) can cause a
// massive amplification attack on the dht. Use with care.
func (dht *IpfsDHT) verifyRecordOnline(ctx context.Context, r *pb.Record) error {
if len(r.Signature) > 0 {
// get the public key, search for it if necessary.
p := peer.ID(r.GetAuthor())
pk, err := dht.GetPublicKey(ctx, p)
if err != nil {
return err
}
err = record.CheckRecordSig(r, pk)
if err != nil {
return err
}
}
return dht.Validator.VerifyRecord(r)
}
func (n *IpfsNode) loadID() error {
if n.Identity != "" {
return errors.New("identity already loaded")
}
cfg, err := n.Repo.Config()
if err != nil {
return err
}
cid := cfg.Identity.PeerID
if cid == "" {
return errors.New("Identity was not set in config (was ipfs init run?)")
}
if len(cid) == 0 {
return errors.New("No peer ID in config! (was ipfs init run?)")
}
n.Identity = peer.ID(b58.Decode(cid))
return nil
}
func (s *Server) handleMessage(
ctx context.Context, p peer.ID, req *dhtpb.Message) (peer.ID, *dhtpb.Message) {
defer log.EventBegin(ctx, "routingMessageReceived", req, p).Done()
var response = dhtpb.NewMessage(req.GetType(), req.GetKey(), req.GetClusterLevel())
switch req.GetType() {
case dhtpb.Message_GET_VALUE:
rawRecord, err := getRoutingRecord(s.routingBackend, key.Key(req.GetKey()))
if err != nil {
return "", nil
}
response.Record = rawRecord
return p, response
case dhtpb.Message_PUT_VALUE:
// FIXME: verify complains that the peer's ID is not present in the
// peerstore. Mocknet problem?
// if err := verify(s.peerstore, req.GetRecord()); err != nil {
// log.Event(ctx, "validationFailed", req, p)
// return "", nil
// }
putRoutingRecord(s.routingBackend, key.Key(req.GetKey()), req.GetRecord())
return p, req
case dhtpb.Message_FIND_NODE:
p := s.peerstore.PeerInfo(peer.ID(req.GetKey()))
pri := []dhtpb.PeerRoutingInfo{
{
PeerInfo: p,
// Connectedness: TODO
},
}
response.CloserPeers = dhtpb.PeerRoutingInfosToPBPeers(pri)
return p.ID, response
case dhtpb.Message_ADD_PROVIDER:
for _, provider := range req.GetProviderPeers() {
providerID := peer.ID(provider.GetId())
if providerID == p {
store := []*dhtpb.Message_Peer{provider}
storeProvidersToPeerstore(s.peerstore, p, store)
if err := putRoutingProviders(s.routingBackend, key.Key(req.GetKey()), store); err != nil {
return "", nil
}
} else {
log.Event(ctx, "addProviderBadRequest", p, req)
}
}
return "", nil
case dhtpb.Message_GET_PROVIDERS:
providers, err := getRoutingProviders(s.routingBackend, key.Key(req.GetKey()))
if err != nil {
return "", nil
}
response.ProviderPeers = providers
return p, response
case dhtpb.Message_PING:
return p, req
default:
}
return "", nil
}
return
}
if len(req.Arguments()) == 0 {
output, err := printSelf(node)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(output)
return
}
pid := req.Arguments()[0]
id := peer.ID(b58.Decode(pid))
if len(id) == 0 {
res.SetError(cmds.ClientError("Invalid peer id"), cmds.ErrClient)
return
}
// TODO handle offline mode with polymorphism instead of conditionals
if !node.OnlineMode() {
res.SetError(errors.New(offlineIdErrorMessage), cmds.ErrClient)
return
}
p, err := node.Routing.FindPeer(req.Context(), id)
if err == kb.ErrLookupFailure {
res.SetError(errors.New(offlineIdErrorMessage), cmds.ErrClient)
return
func (dht *IpfsDHT) checkLocalDatastore(k key.Key) (*pb.Record, error) {
log.Debugf("%s handleGetValue looking into ds", dht.self)
dskey := k.DsKey()
iVal, err := dht.datastore.Get(dskey)
log.Debugf("%s handleGetValue looking into ds GOT %v", dht.self, iVal)
if err == ds.ErrNotFound {
return nil, nil
}
// if we got an unexpected error, bail.
if err != nil {
return nil, err
}
// if we have the value, send it back
log.Debugf("%s handleGetValue success!", dht.self)
byts, ok := iVal.([]byte)
if !ok {
return nil, fmt.Errorf("datastore had non byte-slice value for %v", dskey)
}
rec := new(pb.Record)
err = proto.Unmarshal(byts, rec)
if err != nil {
log.Debug("Failed to unmarshal dht record from datastore")
return nil, err
}
// if its our record, dont bother checking the times on it
if peer.ID(rec.GetAuthor()) == dht.self {
return rec, nil
}
var recordIsBad bool
recvtime, err := u.ParseRFC3339(rec.GetTimeReceived())
if err != nil {
log.Info("either no receive time set on record, or it was invalid: ", err)
recordIsBad = true
}
if time.Now().Sub(recvtime) > MaxRecordAge {
log.Debug("old record found, tossing.")
recordIsBad = true
}
// NOTE: we do not verify the record here beyond checking these timestamps.
// we put the burden of checking the records on the requester as checking a record
// may be computationally expensive
if recordIsBad {
err := dht.datastore.Delete(dskey)
if err != nil {
log.Error("Failed to delete bad record from datastore: ", err)
}
return nil, nil // can treat this as not having the record at all
}
return rec, nil
}
// runBootstrap builds up list of peers by requesting random peer IDs
func (dht *IpfsDHT) runBootstrap(ctx context.Context, cfg BootstrapConfig) error {
bslog := func(msg string) {
log.Debugf("DHT %s dhtRunBootstrap %s -- routing table size: %d", dht.self, msg, dht.routingTable.Size())
}
bslog("start")
defer bslog("end")
defer log.EventBegin(ctx, "dhtRunBootstrap").Done()
var merr u.MultiErr
randomID := func() peer.ID {
// 16 random bytes is not a valid peer id. it may be fine becuase
// the dht will rehash to its own keyspace anyway.
id := make([]byte, 16)
rand.Read(id)
id = u.Hash(id)
return peer.ID(id)
}
// bootstrap sequentially, as results will compound
ctx, cancel := context.WithTimeout(ctx, cfg.Timeout)
defer cancel()
runQuery := func(ctx context.Context, id peer.ID) {
p, err := dht.FindPeer(ctx, id)
if err == routing.ErrNotFound {
// this isn't an error. this is precisely what we expect.
} else if err != nil {
merr = append(merr, err)
} else {
// woah, actually found a peer with that ID? this shouldn't happen normally
// (as the ID we use is not a real ID). this is an odd error worth logging.
err := fmt.Errorf("Bootstrap peer error: Actually FOUND peer. (%s, %s)", id, p)
log.Warningf("%s", err)
merr = append(merr, err)
}
}
sequential := true
if sequential {
// these should be parallel normally. but can make them sequential for debugging.
// note that the core/bootstrap context deadline should be extended too for that.
for i := 0; i < cfg.Queries; i++ {
id := randomID()
log.Debugf("Bootstrapping query (%d/%d) to random ID: %s", i+1, cfg.Queries, id)
runQuery(ctx, id)
}
} else {
// note on parallelism here: the context is passed in to the queries, so they
// **should** exit when it exceeds, making this function exit on ctx cancel.
// normally, we should be selecting on ctx.Done() here too, but this gets
// complicated to do with WaitGroup, and doesnt wait for the children to exit.
var wg sync.WaitGroup
for i := 0; i < cfg.Queries; i++ {
wg.Add(1)
go func() {
defer wg.Done()
id := randomID()
log.Debugf("Bootstrapping query (%d/%d) to random ID: %s", i+1, cfg.Queries, id)
runQuery(ctx, id)
}()
}
wg.Wait()
}
if len(merr) > 0 {
return merr
}
return nil
}
// PBPeerToPeer turns a *Message_Peer into its peer.PeerInfo counterpart
func PBPeerToPeerInfo(pbp *Message_Peer) peer.PeerInfo {
return peer.PeerInfo{
ID: peer.ID(pbp.GetId()),
Addrs: pbp.Addresses(),
}
}