p2p/discover: add node URL functions, distinguish TCP/UDP ports
The discovery RPC protocol does not yet distinguish TCP and UDP ports. But it can't hurt to do so in our internal model.
This commit is contained in:
Felix Lange
parent
56f777b2fc
commit
8564eb9f7e
289
p2p/discover/node.go
Normal file
289
p2p/discover/node.go
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@ -0,0 +1,289 @@
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package discover
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"math/rand"
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"net"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/ethereum/go-ethereum/crypto/secp256k1"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// Node represents a host on the network.
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type Node struct {
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ID NodeID
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IP net.IP
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DiscPort int // UDP listening port for discovery protocol
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TCPPort int // TCP listening port for RLPx
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active time.Time
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}
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func newNode(id NodeID, addr *net.UDPAddr) *Node {
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return &Node{
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ID: id,
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IP: addr.IP,
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DiscPort: addr.Port,
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TCPPort: addr.Port,
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active: time.Now(),
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}
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}
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func (n *Node) isValid() bool {
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// TODO: don't accept localhost, LAN addresses from internet hosts
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return !n.IP.IsMulticast() && !n.IP.IsUnspecified() && n.TCPPort != 0 && n.DiscPort != 0
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}
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// The string representation of a Node is a URL.
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// Please see ParseNode for a description of the format.
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func (n *Node) String() string {
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addr := net.TCPAddr{IP: n.IP, Port: n.TCPPort}
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u := url.URL{
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Scheme: "enode",
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User: url.User(fmt.Sprintf("%x", n.ID[:])),
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Host: addr.String(),
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}
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if n.DiscPort != n.TCPPort {
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u.RawQuery = "discport=" + strconv.Itoa(n.DiscPort)
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}
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return u.String()
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}
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// ParseNode parses a node URL.
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//
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// A node URL has scheme "enode".
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//
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// The hexadecimal node ID is encoded in the username portion of the
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// URL, separated from the host by an @ sign. The hostname can only be
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// given as an IP address, DNS domain names are not allowed. The port
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// in the host name section is the TCP listening port. If the TCP and
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// UDP (discovery) ports differ, the UDP port is specified as query
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// parameter "discport".
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//
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// In the following example, the node URL describes
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// a node with IP address 10.3.58.6, TCP listening port 30303
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// and UDP discovery port 30301.
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//
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// enode://<hex node id>@10.3.58.6:30303?discport=30301
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func ParseNode(rawurl string) (*Node, error) {
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var n Node
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u, err := url.Parse(rawurl)
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if u.Scheme != "enode" {
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return nil, errors.New("invalid URL scheme, want \"enode\"")
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}
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if u.User == nil {
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return nil, errors.New("does not contain node ID")
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}
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if n.ID, err = HexID(u.User.String()); err != nil {
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return nil, fmt.Errorf("invalid node ID (%v)", err)
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}
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ip, port, err := net.SplitHostPort(u.Host)
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if err != nil {
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return nil, fmt.Errorf("invalid host: %v", err)
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}
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if n.IP = net.ParseIP(ip); n.IP == nil {
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return nil, errors.New("invalid IP address")
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}
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if n.TCPPort, err = strconv.Atoi(port); err != nil {
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return nil, errors.New("invalid port")
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}
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qv := u.Query()
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if qv.Get("discport") == "" {
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n.DiscPort = n.TCPPort
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} else {
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if n.DiscPort, err = strconv.Atoi(qv.Get("discport")); err != nil {
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return nil, errors.New("invalid discport in query")
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}
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}
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return &n, nil
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}
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// MustParseNode parses a node URL. It panics if the URL is not valid.
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func MustParseNode(rawurl string) *Node {
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n, err := ParseNode(rawurl)
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if err != nil {
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panic("invalid node URL: " + err.Error())
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}
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return n
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}
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func (n Node) EncodeRLP(w io.Writer) error {
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return rlp.Encode(w, rpcNode{IP: n.IP.String(), Port: uint16(n.TCPPort), ID: n.ID})
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}
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func (n *Node) DecodeRLP(s *rlp.Stream) (err error) {
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var ext rpcNode
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if err = s.Decode(&ext); err == nil {
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n.TCPPort = int(ext.Port)
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n.DiscPort = int(ext.Port)
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n.ID = ext.ID
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if n.IP = net.ParseIP(ext.IP); n.IP == nil {
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return errors.New("invalid IP string")
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}
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}
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return err
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}
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// NodeID is a unique identifier for each node.
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// The node identifier is a marshaled elliptic curve public key.
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type NodeID [512 / 8]byte
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// NodeID prints as a long hexadecimal number.
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func (n NodeID) String() string {
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return fmt.Sprintf("%#x", n[:])
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}
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// The Go syntax representation of a NodeID is a call to HexID.
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func (n NodeID) GoString() string {
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return fmt.Sprintf("discover.HexID(\"%#x\")", n[:])
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}
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// HexID converts a hex string to a NodeID.
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// The string may be prefixed with 0x.
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func HexID(in string) (NodeID, error) {
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if strings.HasPrefix(in, "0x") {
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in = in[2:]
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}
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var id NodeID
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b, err := hex.DecodeString(in)
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if err != nil {
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return id, err
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} else if len(b) != len(id) {
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return id, fmt.Errorf("wrong length, need %d hex bytes", len(id))
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}
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copy(id[:], b)
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return id, nil
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}
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// MustHexID converts a hex string to a NodeID.
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// It panics if the string is not a valid NodeID.
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func MustHexID(in string) NodeID {
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id, err := HexID(in)
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if err != nil {
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panic(err)
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}
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return id
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}
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// PubkeyID returns a marshaled representation of the given public key.
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func PubkeyID(pub *ecdsa.PublicKey) NodeID {
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var id NodeID
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pbytes := elliptic.Marshal(pub.Curve, pub.X, pub.Y)
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if len(pbytes)-1 != len(id) {
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panic(fmt.Errorf("need %d bit pubkey, got %d bits", (len(id)+1)*8, len(pbytes)))
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}
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copy(id[:], pbytes[1:])
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return id
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}
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// recoverNodeID computes the public key used to sign the
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// given hash from the signature.
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func recoverNodeID(hash, sig []byte) (id NodeID, err error) {
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pubkey, err := secp256k1.RecoverPubkey(hash, sig)
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if err != nil {
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return id, err
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}
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if len(pubkey)-1 != len(id) {
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return id, fmt.Errorf("recovered pubkey has %d bits, want %d bits", len(pubkey)*8, (len(id)+1)*8)
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}
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for i := range id {
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id[i] = pubkey[i+1]
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}
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return id, nil
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}
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// distcmp compares the distances a->target and b->target.
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// Returns -1 if a is closer to target, 1 if b is closer to target
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// and 0 if they are equal.
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func distcmp(target, a, b NodeID) int {
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for i := range target {
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da := a[i] ^ target[i]
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db := b[i] ^ target[i]
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if da > db {
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return 1
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} else if da < db {
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return -1
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}
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}
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return 0
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}
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// table of leading zero counts for bytes [0..255]
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var lzcount = [256]int{
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8, 7, 6, 6, 5, 5, 5, 5,
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4, 4, 4, 4, 4, 4, 4, 4,
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3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3,
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2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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}
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// logdist returns the logarithmic distance between a and b, log2(a ^ b).
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func logdist(a, b NodeID) int {
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lz := 0
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for i := range a {
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x := a[i] ^ b[i]
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if x == 0 {
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lz += 8
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} else {
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lz += lzcount[x]
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break
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}
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}
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return len(a)*8 - lz
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}
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// randomID returns a random NodeID such that logdist(a, b) == n
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func randomID(a NodeID, n int) (b NodeID) {
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if n == 0 {
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return a
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}
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// flip bit at position n, fill the rest with random bits
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b = a
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pos := len(a) - n/8 - 1
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bit := byte(0x01) << (byte(n%8) - 1)
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if bit == 0 {
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pos++
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bit = 0x80
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}
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b[pos] = a[pos]&^bit | ^a[pos]&bit // TODO: randomize end bits
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for i := pos + 1; i < len(a); i++ {
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b[i] = byte(rand.Intn(255))
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}
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return b
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}
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201
p2p/discover/node_test.go
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201
p2p/discover/node_test.go
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package discover
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import (
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"math/big"
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"math/rand"
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"net"
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"reflect"
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"testing"
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"testing/quick"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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)
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var (
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quickrand = rand.New(rand.NewSource(time.Now().Unix()))
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quickcfg = &quick.Config{MaxCount: 5000, Rand: quickrand}
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)
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var parseNodeTests = []struct {
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rawurl string
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wantError string
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wantResult *Node
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}{
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{
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rawurl: "http://foobar",
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wantError: `invalid URL scheme, want "enode"`,
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},
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{
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rawurl: "enode://foobar",
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wantError: `does not contain node ID`,
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},
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{
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rawurl: "enode://01010101@123.124.125.126:3",
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wantError: `invalid node ID (wrong length, need 64 hex bytes)`,
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},
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{
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rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@hostname:3",
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wantError: `invalid IP address`,
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},
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{
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rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:foo",
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wantError: `invalid port`,
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},
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{
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rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:3?discport=foo",
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wantError: `invalid discport in query`,
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},
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{
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rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150",
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wantResult: &Node{
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ID: MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
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IP: net.ParseIP("127.0.0.1"),
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DiscPort: 52150,
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TCPPort: 52150,
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},
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},
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{
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rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[::]:52150",
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wantResult: &Node{
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ID: MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
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IP: net.ParseIP("::"),
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DiscPort: 52150,
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TCPPort: 52150,
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},
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},
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{
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rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150?discport=223344",
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wantResult: &Node{
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ID: MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
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IP: net.ParseIP("127.0.0.1"),
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DiscPort: 223344,
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TCPPort: 52150,
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},
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},
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}
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func TestParseNode(t *testing.T) {
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for i, test := range parseNodeTests {
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n, err := ParseNode(test.rawurl)
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if err == nil && test.wantError != "" {
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t.Errorf("test %d: got nil error, expected %#q", i, test.wantError)
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continue
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}
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if err != nil && err.Error() != test.wantError {
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t.Errorf("test %d: got error %#q, expected %#q", i, err.Error(), test.wantError)
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continue
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}
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if !reflect.DeepEqual(n, test.wantResult) {
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t.Errorf("test %d: result mismatch:\ngot: %#v, want: %#v", i, n, test.wantResult)
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}
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}
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}
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func TestNodeString(t *testing.T) {
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for i, test := range parseNodeTests {
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if test.wantError != "" {
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continue
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}
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str := test.wantResult.String()
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if str != test.rawurl {
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t.Errorf("test %d: Node.String() mismatch:\ngot: %s\nwant: %s", i, str, test.rawurl)
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}
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}
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}
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func TestHexID(t *testing.T) {
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ref := NodeID{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 106, 217, 182, 31, 165, 174, 1, 67, 7, 235, 220, 150, 66, 83, 173, 205, 159, 44, 10, 57, 42, 161, 26, 188}
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id1 := MustHexID("0x000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
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id2 := MustHexID("000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
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if id1 != ref {
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t.Errorf("wrong id1\ngot %v\nwant %v", id1[:], ref[:])
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}
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if id2 != ref {
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t.Errorf("wrong id2\ngot %v\nwant %v", id2[:], ref[:])
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}
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}
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func TestNodeID_recover(t *testing.T) {
|
||||
prv := newkey()
|
||||
hash := make([]byte, 32)
|
||||
sig, err := crypto.Sign(hash, prv)
|
||||
if err != nil {
|
||||
t.Fatalf("signing error: %v", err)
|
||||
}
|
||||
|
||||
pub := PubkeyID(&prv.PublicKey)
|
||||
recpub, err := recoverNodeID(hash, sig)
|
||||
if err != nil {
|
||||
t.Fatalf("recovery error: %v", err)
|
||||
}
|
||||
if pub != recpub {
|
||||
t.Errorf("recovered wrong pubkey:\ngot: %v\nwant: %v", recpub, pub)
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_distcmp(t *testing.T) {
|
||||
distcmpBig := func(target, a, b NodeID) int {
|
||||
tbig := new(big.Int).SetBytes(target[:])
|
||||
abig := new(big.Int).SetBytes(a[:])
|
||||
bbig := new(big.Int).SetBytes(b[:])
|
||||
return new(big.Int).Xor(tbig, abig).Cmp(new(big.Int).Xor(tbig, bbig))
|
||||
}
|
||||
if err := quick.CheckEqual(distcmp, distcmpBig, quickcfg); err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
}
|
||||
|
||||
// the random tests is likely to miss the case where they're equal.
|
||||
func TestNodeID_distcmpEqual(t *testing.T) {
|
||||
base := NodeID{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
|
||||
x := NodeID{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
|
||||
if distcmp(base, x, x) != 0 {
|
||||
t.Errorf("distcmp(base, x, x) != 0")
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_logdist(t *testing.T) {
|
||||
logdistBig := func(a, b NodeID) int {
|
||||
abig, bbig := new(big.Int).SetBytes(a[:]), new(big.Int).SetBytes(b[:])
|
||||
return new(big.Int).Xor(abig, bbig).BitLen()
|
||||
}
|
||||
if err := quick.CheckEqual(logdist, logdistBig, quickcfg); err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
}
|
||||
|
||||
// the random tests is likely to miss the case where they're equal.
|
||||
func TestNodeID_logdistEqual(t *testing.T) {
|
||||
x := NodeID{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
|
||||
if logdist(x, x) != 0 {
|
||||
t.Errorf("logdist(x, x) != 0")
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_randomID(t *testing.T) {
|
||||
// we don't use quick.Check here because its output isn't
|
||||
// very helpful when the test fails.
|
||||
for i := 0; i < quickcfg.MaxCount; i++ {
|
||||
a := gen(NodeID{}, quickrand).(NodeID)
|
||||
dist := quickrand.Intn(len(NodeID{}) * 8)
|
||||
result := randomID(a, dist)
|
||||
actualdist := logdist(result, a)
|
||||
|
||||
if dist != actualdist {
|
||||
t.Log("a: ", a)
|
||||
t.Log("result:", result)
|
||||
t.Fatalf("#%d: distance of result is %d, want %d", i, actualdist, dist)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (NodeID) Generate(rand *rand.Rand, size int) reflect.Value {
|
||||
var id NodeID
|
||||
m := rand.Intn(len(id))
|
||||
for i := len(id) - 1; i > m; i-- {
|
||||
id[i] = byte(rand.Uint32())
|
||||
}
|
||||
return reflect.ValueOf(id)
|
||||
}
|
||||
@ -7,20 +7,10 @@
|
||||
package discover
|
||||
|
||||
import (
|
||||
"crypto/ecdsa"
|
||||
"crypto/elliptic"
|
||||
"encoding/hex"
|
||||
"fmt"
|
||||
"io"
|
||||
"math/rand"
|
||||
"net"
|
||||
"sort"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/ethereum/go-ethereum/crypto/secp256k1"
|
||||
"github.com/ethereum/go-ethereum/rlp"
|
||||
)
|
||||
|
||||
const (
|
||||
@ -53,36 +43,10 @@ type bucket struct {
|
||||
entries []*Node
|
||||
}
|
||||
|
||||
// Node represents node metadata that is stored in the table.
|
||||
type Node struct {
|
||||
Addr *net.UDPAddr
|
||||
ID NodeID
|
||||
|
||||
active time.Time
|
||||
}
|
||||
|
||||
type rpcNode struct {
|
||||
IP string
|
||||
Port uint16
|
||||
ID NodeID
|
||||
}
|
||||
|
||||
func (n Node) EncodeRLP(w io.Writer) error {
|
||||
return rlp.Encode(w, rpcNode{IP: n.Addr.IP.String(), Port: uint16(n.Addr.Port), ID: n.ID})
|
||||
}
|
||||
func (n *Node) DecodeRLP(s *rlp.Stream) (err error) {
|
||||
var ext rpcNode
|
||||
if err = s.Decode(&ext); err == nil {
|
||||
n.Addr = &net.UDPAddr{IP: net.ParseIP(ext.IP), Port: int(ext.Port)}
|
||||
n.ID = ext.ID
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func newTable(t transport, ourID NodeID, ourAddr *net.UDPAddr) *Table {
|
||||
tab := &Table{net: t, self: &Node{ID: ourID, Addr: ourAddr}}
|
||||
tab := &Table{net: t, self: newNode(ourID, ourAddr)}
|
||||
for i := range tab.buckets {
|
||||
tab.buckets[i] = &bucket{}
|
||||
tab.buckets[i] = new(bucket)
|
||||
}
|
||||
return tab
|
||||
}
|
||||
@ -217,7 +181,7 @@ func (tab *Table) len() (n int) {
|
||||
func (tab *Table) bumpOrAdd(node NodeID, from *net.UDPAddr) (n *Node) {
|
||||
b := tab.buckets[logdist(tab.self.ID, node)]
|
||||
if n = b.bump(node); n == nil {
|
||||
n = &Node{ID: node, Addr: from, active: time.Now()}
|
||||
n = newNode(node, from)
|
||||
if len(b.entries) == bucketSize {
|
||||
tab.pingReplace(n, b)
|
||||
} else {
|
||||
@ -238,6 +202,7 @@ func (tab *Table) pingReplace(n *Node, b *bucket) {
|
||||
tab.mutex.Lock()
|
||||
if len(b.entries) > 0 && b.entries[len(b.entries)-1] == old {
|
||||
// slide down other entries and put the new one in front.
|
||||
// TODO: insert in correct position to keep the order
|
||||
copy(b.entries[1:], b.entries)
|
||||
b.entries[0] = n
|
||||
}
|
||||
@ -312,157 +277,3 @@ func (h *nodesByDistance) push(n *Node, maxElems int) {
|
||||
h.entries[ix] = n
|
||||
}
|
||||
}
|
||||
|
||||
// NodeID is a unique identifier for each node.
|
||||
// The node identifier is a marshaled elliptic curve public key.
|
||||
type NodeID [512 / 8]byte
|
||||
|
||||
// NodeID prints as a long hexadecimal number.
|
||||
func (n NodeID) String() string {
|
||||
return fmt.Sprintf("%#x", n[:])
|
||||
}
|
||||
|
||||
// The Go syntax representation of a NodeID is a call to HexID.
|
||||
func (n NodeID) GoString() string {
|
||||
return fmt.Sprintf("HexID(\"%#x\")", n[:])
|
||||
}
|
||||
|
||||
// HexID converts a hex string to a NodeID.
|
||||
// The string may be prefixed with 0x.
|
||||
func HexID(in string) (NodeID, error) {
|
||||
if strings.HasPrefix(in, "0x") {
|
||||
in = in[2:]
|
||||
}
|
||||
var id NodeID
|
||||
b, err := hex.DecodeString(in)
|
||||
if err != nil {
|
||||
return id, err
|
||||
} else if len(b) != len(id) {
|
||||
return id, fmt.Errorf("wrong length, need %d hex bytes", len(id))
|
||||
}
|
||||
copy(id[:], b)
|
||||
return id, nil
|
||||
}
|
||||
|
||||
// MustHexID converts a hex string to a NodeID.
|
||||
// It panics if the string is not a valid NodeID.
|
||||
func MustHexID(in string) NodeID {
|
||||
id, err := HexID(in)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
return id
|
||||
}
|
||||
|
||||
func PubkeyID(pub *ecdsa.PublicKey) NodeID {
|
||||
var id NodeID
|
||||
pbytes := elliptic.Marshal(pub.Curve, pub.X, pub.Y)
|
||||
if len(pbytes)-1 != len(id) {
|
||||
panic(fmt.Errorf("invalid key: need %d bit pubkey, got %d bits", (len(id)+1)*8, len(pbytes)))
|
||||
}
|
||||
copy(id[:], pbytes[1:])
|
||||
return id
|
||||
}
|
||||
|
||||
// recoverNodeID computes the public key used to sign the
|
||||
// given hash from the signature.
|
||||
func recoverNodeID(hash, sig []byte) (id NodeID, err error) {
|
||||
pubkey, err := secp256k1.RecoverPubkey(hash, sig)
|
||||
if err != nil {
|
||||
return id, err
|
||||
}
|
||||
if len(pubkey)-1 != len(id) {
|
||||
return id, fmt.Errorf("recovered pubkey has %d bits, want %d bits", len(pubkey)*8, (len(id)+1)*8)
|
||||
}
|
||||
for i := range id {
|
||||
id[i] = pubkey[i+1]
|
||||
}
|
||||
return id, nil
|
||||
}
|
||||
|
||||
// distcmp compares the distances a->target and b->target.
|
||||
// Returns -1 if a is closer to target, 1 if b is closer to target
|
||||
// and 0 if they are equal.
|
||||
func distcmp(target, a, b NodeID) int {
|
||||
for i := range target {
|
||||
da := a[i] ^ target[i]
|
||||
db := b[i] ^ target[i]
|
||||
if da > db {
|
||||
return 1
|
||||
} else if da < db {
|
||||
return -1
|
||||
}
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
// table of leading zero counts for bytes [0..255]
|
||||
var lzcount = [256]int{
|
||||
8, 7, 6, 6, 5, 5, 5, 5,
|
||||
4, 4, 4, 4, 4, 4, 4, 4,
|
||||
3, 3, 3, 3, 3, 3, 3, 3,
|
||||
3, 3, 3, 3, 3, 3, 3, 3,
|
||||
2, 2, 2, 2, 2, 2, 2, 2,
|
||||
2, 2, 2, 2, 2, 2, 2, 2,
|
||||
2, 2, 2, 2, 2, 2, 2, 2,
|
||||
2, 2, 2, 2, 2, 2, 2, 2,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
}
|
||||
|
||||
// logdist returns the logarithmic distance between a and b, log2(a ^ b).
|
||||
func logdist(a, b NodeID) int {
|
||||
lz := 0
|
||||
for i := range a {
|
||||
x := a[i] ^ b[i]
|
||||
if x == 0 {
|
||||
lz += 8
|
||||
} else {
|
||||
lz += lzcount[x]
|
||||
break
|
||||
}
|
||||
}
|
||||
return len(a)*8 - lz
|
||||
}
|
||||
|
||||
// randomID returns a random NodeID such that logdist(a, b) == n
|
||||
func randomID(a NodeID, n int) (b NodeID) {
|
||||
if n == 0 {
|
||||
return a
|
||||
}
|
||||
// flip bit at position n, fill the rest with random bits
|
||||
b = a
|
||||
pos := len(a) - n/8 - 1
|
||||
bit := byte(0x01) << (byte(n%8) - 1)
|
||||
if bit == 0 {
|
||||
pos++
|
||||
bit = 0x80
|
||||
}
|
||||
b[pos] = a[pos]&^bit | ^a[pos]&bit // TODO: randomize end bits
|
||||
for i := pos + 1; i < len(a); i++ {
|
||||
b[i] = byte(rand.Intn(255))
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
@ -4,7 +4,6 @@ import (
|
||||
"crypto/ecdsa"
|
||||
"errors"
|
||||
"fmt"
|
||||
"math/big"
|
||||
"math/rand"
|
||||
"net"
|
||||
"reflect"
|
||||
@ -15,107 +14,6 @@ import (
|
||||
"github.com/ethereum/go-ethereum/crypto"
|
||||
)
|
||||
|
||||
var (
|
||||
quickrand = rand.New(rand.NewSource(time.Now().Unix()))
|
||||
quickcfg = &quick.Config{MaxCount: 5000, Rand: quickrand}
|
||||
)
|
||||
|
||||
func TestHexID(t *testing.T) {
|
||||
ref := NodeID{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 106, 217, 182, 31, 165, 174, 1, 67, 7, 235, 220, 150, 66, 83, 173, 205, 159, 44, 10, 57, 42, 161, 26, 188}
|
||||
id1 := MustHexID("0x000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
|
||||
id2 := MustHexID("000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
|
||||
|
||||
if id1 != ref {
|
||||
t.Errorf("wrong id1\ngot %v\nwant %v", id1[:], ref[:])
|
||||
}
|
||||
if id2 != ref {
|
||||
t.Errorf("wrong id2\ngot %v\nwant %v", id2[:], ref[:])
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_recover(t *testing.T) {
|
||||
prv := newkey()
|
||||
hash := make([]byte, 32)
|
||||
sig, err := crypto.Sign(hash, prv)
|
||||
if err != nil {
|
||||
t.Fatalf("signing error: %v", err)
|
||||
}
|
||||
|
||||
pub := PubkeyID(&prv.PublicKey)
|
||||
recpub, err := recoverNodeID(hash, sig)
|
||||
if err != nil {
|
||||
t.Fatalf("recovery error: %v", err)
|
||||
}
|
||||
if pub != recpub {
|
||||
t.Errorf("recovered wrong pubkey:\ngot: %v\nwant: %v", recpub, pub)
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_distcmp(t *testing.T) {
|
||||
distcmpBig := func(target, a, b NodeID) int {
|
||||
tbig := new(big.Int).SetBytes(target[:])
|
||||
abig := new(big.Int).SetBytes(a[:])
|
||||
bbig := new(big.Int).SetBytes(b[:])
|
||||
return new(big.Int).Xor(tbig, abig).Cmp(new(big.Int).Xor(tbig, bbig))
|
||||
}
|
||||
if err := quick.CheckEqual(distcmp, distcmpBig, quickcfg); err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
}
|
||||
|
||||
// the random tests is likely to miss the case where they're equal.
|
||||
func TestNodeID_distcmpEqual(t *testing.T) {
|
||||
base := NodeID{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
|
||||
x := NodeID{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
|
||||
if distcmp(base, x, x) != 0 {
|
||||
t.Errorf("distcmp(base, x, x) != 0")
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_logdist(t *testing.T) {
|
||||
logdistBig := func(a, b NodeID) int {
|
||||
abig, bbig := new(big.Int).SetBytes(a[:]), new(big.Int).SetBytes(b[:])
|
||||
return new(big.Int).Xor(abig, bbig).BitLen()
|
||||
}
|
||||
if err := quick.CheckEqual(logdist, logdistBig, quickcfg); err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
}
|
||||
|
||||
// the random tests is likely to miss the case where they're equal.
|
||||
func TestNodeID_logdistEqual(t *testing.T) {
|
||||
x := NodeID{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
|
||||
if logdist(x, x) != 0 {
|
||||
t.Errorf("logdist(x, x) != 0")
|
||||
}
|
||||
}
|
||||
|
||||
func TestNodeID_randomID(t *testing.T) {
|
||||
// we don't use quick.Check here because its output isn't
|
||||
// very helpful when the test fails.
|
||||
for i := 0; i < quickcfg.MaxCount; i++ {
|
||||
a := gen(NodeID{}, quickrand).(NodeID)
|
||||
dist := quickrand.Intn(len(NodeID{}) * 8)
|
||||
result := randomID(a, dist)
|
||||
actualdist := logdist(result, a)
|
||||
|
||||
if dist != actualdist {
|
||||
t.Log("a: ", a)
|
||||
t.Log("result:", result)
|
||||
t.Fatalf("#%d: distance of result is %d, want %d", i, actualdist, dist)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (NodeID) Generate(rand *rand.Rand, size int) reflect.Value {
|
||||
var id NodeID
|
||||
m := rand.Intn(len(id))
|
||||
for i := len(id) - 1; i > m; i-- {
|
||||
id[i] = byte(rand.Uint32())
|
||||
}
|
||||
return reflect.ValueOf(id)
|
||||
}
|
||||
|
||||
func TestTable_bumpOrAddPingReplace(t *testing.T) {
|
||||
pingC := make(pingC)
|
||||
tab := newTable(pingC, NodeID{}, &net.UDPAddr{})
|
||||
@ -123,7 +21,7 @@ func TestTable_bumpOrAddPingReplace(t *testing.T) {
|
||||
|
||||
// this bumpOrAdd should not replace the last node
|
||||
// because the node replies to ping.
|
||||
new := tab.bumpOrAdd(randomID(tab.self.ID, 200), nil)
|
||||
new := tab.bumpOrAdd(randomID(tab.self.ID, 200), &net.UDPAddr{})
|
||||
|
||||
pinged := <-pingC
|
||||
if pinged != last.ID {
|
||||
@ -149,7 +47,7 @@ func TestTable_bumpOrAddPingTimeout(t *testing.T) {
|
||||
|
||||
// this bumpOrAdd should replace the last node
|
||||
// because the node does not reply to ping.
|
||||
new := tab.bumpOrAdd(randomID(tab.self.ID, 200), nil)
|
||||
new := tab.bumpOrAdd(randomID(tab.self.ID, 200), &net.UDPAddr{})
|
||||
|
||||
// wait for async bucket update. damn. this needs to go away.
|
||||
time.Sleep(2 * time.Millisecond)
|
||||
@ -329,19 +227,17 @@ type findnodeOracle struct {
|
||||
}
|
||||
|
||||
func (t findnodeOracle) findnode(n *Node, target NodeID) ([]*Node, error) {
|
||||
t.t.Logf("findnode query at dist %d", n.Addr.Port)
|
||||
t.t.Logf("findnode query at dist %d", n.DiscPort)
|
||||
// current log distance is encoded in port number
|
||||
var result []*Node
|
||||
switch port := n.Addr.Port; port {
|
||||
switch n.DiscPort {
|
||||
case 0:
|
||||
panic("query to node at distance 0")
|
||||
case 1:
|
||||
result = append(result, &Node{ID: t.target, Addr: &net.UDPAddr{Port: 0}})
|
||||
default:
|
||||
// TODO: add more randomness to distances
|
||||
port--
|
||||
next := n.DiscPort - 1
|
||||
for i := 0; i < bucketSize; i++ {
|
||||
result = append(result, &Node{ID: randomID(t.target, port), Addr: &net.UDPAddr{Port: port}})
|
||||
result = append(result, &Node{ID: randomID(t.target, next), DiscPort: next})
|
||||
}
|
||||
}
|
||||
return result, nil
|
||||
|
||||
@ -69,6 +69,12 @@ type (
|
||||
}
|
||||
)
|
||||
|
||||
type rpcNode struct {
|
||||
IP string
|
||||
Port uint16
|
||||
ID NodeID
|
||||
}
|
||||
|
||||
// udp implements the RPC protocol.
|
||||
type udp struct {
|
||||
conn *net.UDPConn
|
||||
@ -121,7 +127,7 @@ func ListenUDP(priv *ecdsa.PrivateKey, laddr string) (*Table, error) {
|
||||
return nil, err
|
||||
}
|
||||
net.Table = newTable(net, PubkeyID(&priv.PublicKey), realaddr)
|
||||
log.Debugf("Listening on %v, my ID %x\n", realaddr, net.self.ID[:])
|
||||
log.Debugf("Listening, %v\n", net.self)
|
||||
return net.Table, nil
|
||||
}
|
||||
|
||||
@ -159,8 +165,8 @@ func (t *udp) ping(e *Node) error {
|
||||
// TODO: maybe check for ReplyTo field in callback to measure RTT
|
||||
errc := t.pending(e.ID, pongPacket, func(interface{}) bool { return true })
|
||||
t.send(e, pingPacket, ping{
|
||||
IP: t.self.Addr.String(),
|
||||
Port: uint16(t.self.Addr.Port),
|
||||
IP: t.self.IP.String(),
|
||||
Port: uint16(t.self.TCPPort),
|
||||
Expiration: uint64(time.Now().Add(expiration).Unix()),
|
||||
})
|
||||
return <-errc
|
||||
@ -176,7 +182,7 @@ func (t *udp) findnode(to *Node, target NodeID) ([]*Node, error) {
|
||||
for i := 0; i < len(reply.Nodes); i++ {
|
||||
nreceived++
|
||||
n := reply.Nodes[i]
|
||||
if validAddr(n.Addr) && n.ID != t.self.ID {
|
||||
if n.ID != t.self.ID && n.isValid() {
|
||||
nodes = append(nodes, n)
|
||||
}
|
||||
}
|
||||
@ -191,10 +197,6 @@ func (t *udp) findnode(to *Node, target NodeID) ([]*Node, error) {
|
||||
return nodes, err
|
||||
}
|
||||
|
||||
func validAddr(a *net.UDPAddr) bool {
|
||||
return !a.IP.IsMulticast() && !a.IP.IsUnspecified() && a.Port != 0
|
||||
}
|
||||
|
||||
// pending adds a reply callback to the pending reply queue.
|
||||
// see the documentation of type pending for a detailed explanation.
|
||||
func (t *udp) pending(id NodeID, ptype byte, callback func(interface{}) bool) <-chan error {
|
||||
@ -302,8 +304,9 @@ func (t *udp) send(to *Node, ptype byte, req interface{}) error {
|
||||
// the future.
|
||||
copy(packet, crypto.Sha3(packet[macSize:]))
|
||||
|
||||
log.DebugDetailf(">>> %v %T %v\n", to.Addr, req, req)
|
||||
if _, err = t.conn.WriteToUDP(packet, to.Addr); err != nil {
|
||||
toaddr := &net.UDPAddr{IP: to.IP, Port: to.DiscPort}
|
||||
log.DebugDetailf(">>> %v %T %v\n", toaddr, req, req)
|
||||
if _, err = t.conn.WriteToUDP(packet, toaddr); err != nil {
|
||||
log.DebugDetailln("UDP send failed:", err)
|
||||
}
|
||||
return err
|
||||
@ -365,11 +368,14 @@ func (req *ping) handle(t *udp, from *net.UDPAddr, fromID NodeID, mac []byte) er
|
||||
return errExpired
|
||||
}
|
||||
t.mutex.Lock()
|
||||
// Note: we're ignoring the provided IP/Port right now.
|
||||
e := t.bumpOrAdd(fromID, from)
|
||||
// Note: we're ignoring the provided IP address right now
|
||||
n := t.bumpOrAdd(fromID, from)
|
||||
if req.Port != 0 {
|
||||
n.TCPPort = int(req.Port)
|
||||
}
|
||||
t.mutex.Unlock()
|
||||
|
||||
t.send(e, pongPacket, pong{
|
||||
t.send(n, pongPacket, pong{
|
||||
ReplyTok: mac,
|
||||
Expiration: uint64(time.Now().Add(expiration).Unix()),
|
||||
})
|
||||
|
||||
@ -4,6 +4,7 @@ import (
|
||||
logpkg "log"
|
||||
"net"
|
||||
"os"
|
||||
"reflect"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
@ -11,7 +12,7 @@ import (
|
||||
)
|
||||
|
||||
func init() {
|
||||
logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, logpkg.LstdFlags, logger.DebugLevel))
|
||||
logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, logpkg.LstdFlags, logger.ErrorLevel))
|
||||
}
|
||||
|
||||
func TestUDP_ping(t *testing.T) {
|
||||
@ -52,7 +53,7 @@ func TestUDP_findnode(t *testing.T) {
|
||||
defer n1.Close()
|
||||
defer n2.Close()
|
||||
|
||||
entry := &Node{ID: NodeID{1}, Addr: &net.UDPAddr{IP: net.IP{1, 2, 3, 4}, Port: 15}}
|
||||
entry := MustParseNode("enode://9d8a19597e312ef32d76e6b4903bb43d7bcd892d17b769d30b404bd3a4c2dca6c86184b17d0fdeeafe3b01e0e912d990ddc853db3f325d5419f31446543c30be@127.0.0.1:54194")
|
||||
n2.add([]*Node{entry})
|
||||
|
||||
target := randomID(n1.self.ID, 100)
|
||||
@ -60,7 +61,7 @@ func TestUDP_findnode(t *testing.T) {
|
||||
if len(result) != 1 {
|
||||
t.Fatalf("wrong number of results: got %d, want 1", len(result))
|
||||
}
|
||||
if result[0].ID != entry.ID {
|
||||
if !reflect.DeepEqual(result[0], entry) {
|
||||
t.Errorf("wrong result: got %v, want %v", result[0], entry)
|
||||
}
|
||||
}
|
||||
@ -103,8 +104,10 @@ func TestUDP_findnodeMultiReply(t *testing.T) {
|
||||
nodes := make([]*Node, bucketSize)
|
||||
for i := range nodes {
|
||||
nodes[i] = &Node{
|
||||
Addr: &net.UDPAddr{IP: net.IP{1, 2, 3, 4}, Port: i + 1},
|
||||
ID: randomID(n2.self.ID, i+1),
|
||||
IP: net.IP{1, 2, 3, 4},
|
||||
DiscPort: i + 1,
|
||||
TCPPort: i + 1,
|
||||
ID: randomID(n2.self.ID, i+1),
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -136,7 +136,7 @@ func (srv *Server) PeerCount() int {
|
||||
// SuggestPeer creates a connection to the given Node if it
|
||||
// is not already connected.
|
||||
func (srv *Server) SuggestPeer(ip net.IP, port int, id discover.NodeID) {
|
||||
srv.peerConnect <- &discover.Node{ID: id, Addr: &net.UDPAddr{IP: ip, Port: port}}
|
||||
srv.peerConnect <- &discover.Node{ID: id, IP: ip, TCPPort: port}
|
||||
}
|
||||
|
||||
// Broadcast sends an RLP-encoded message to all connected peers.
|
||||
@ -364,8 +364,9 @@ func (srv *Server) dialLoop() {
|
||||
}
|
||||
|
||||
func (srv *Server) dialNode(dest *discover.Node) {
|
||||
srvlog.Debugf("Dialing %v\n", dest.Addr)
|
||||
conn, err := srv.Dialer.Dial("tcp", dest.Addr.String())
|
||||
addr := &net.TCPAddr{IP: dest.IP, Port: dest.TCPPort}
|
||||
srvlog.Debugf("Dialing %v\n", dest)
|
||||
conn, err := srv.Dialer.Dial("tcp", addr.String())
|
||||
if err != nil {
|
||||
srvlog.DebugDetailf("dial error: %v", err)
|
||||
return
|
||||
|
||||
@ -91,8 +91,7 @@ func TestServerDial(t *testing.T) {
|
||||
|
||||
// tell the server to connect
|
||||
tcpAddr := listener.Addr().(*net.TCPAddr)
|
||||
connAddr := &discover.Node{Addr: &net.UDPAddr{IP: tcpAddr.IP, Port: tcpAddr.Port}}
|
||||
srv.peerConnect <- connAddr
|
||||
srv.peerConnect <- &discover.Node{IP: tcpAddr.IP, TCPPort: tcpAddr.Port}
|
||||
|
||||
select {
|
||||
case conn := <-accepted:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user