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p2p, p2p/discover, p2p/discv5: implement UDP port sharing

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This commit is contained in:
Zsolt Felfoldi 2017-09-25 15:12:58 +02:00
parent 8c33ac10bf
commit c9a1981292
9 changed files with 128 additions and 49 deletions
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25
cmd/bootnode/main.go
View file

@ -21,6 +21,7 @@ import (
"crypto/ecdsa"
"flag"
"fmt"
"net"
"os"
"github.com/ethereum/go-ethereum/cmd/utils"
@ -96,12 +97,32 @@ func main() {
}
}
addr, err := net.ResolveUDPAddr("udp", *listenAddr)
if err != nil {
utils.Fatalf("-ResolveUDPAddr: %v", err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
utils.Fatalf("-ListenUDP: %v", err)
}
realaddr := conn.LocalAddr().(*net.UDPAddr)
if natm != nil {
if !realaddr.IP.IsLoopback() {
go nat.Map(natm, nil, "udp", realaddr.Port, realaddr.Port, "ethereum discovery")
}
// TODO: react to external IP changes over time.
if ext, err := natm.ExternalIP(); err == nil {
realaddr = &net.UDPAddr{IP: ext, Port: realaddr.Port}
}
}
if *runv5 {
if _, err := discv5.ListenUDP(nodeKey, *listenAddr, natm, "", restrictList); err != nil {
if _, err := discv5.ListenUDP(nodeKey, conn, realaddr, "", restrictList); err != nil {
utils.Fatalf("%v", err)
}
} else {
if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, "", restrictList); err != nil {
if _, err := discover.ListenUDP(nodeKey, conn, realaddr, nil, "", restrictList); err != nil {
utils.Fatalf("%v", err)
}
}

44
p2p/discover/udp.go
View file

@ -210,17 +210,15 @@ type reply struct {
matched chan<- bool
}
// ReadPacket is sent to the unhandled channel when it could not be processed
type ReadPacket struct {
Data []byte
Addr *net.UDPAddr
}
// ListenUDP returns a new table that listens for UDP packets on laddr.
func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string, netrestrict *netutil.Netlist) (*Table, error) {
addr, err := net.ResolveUDPAddr("udp", laddr)
if err != nil {
return nil, err
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, err
}
tab, _, err := newUDP(priv, conn, natm, nodeDBPath, netrestrict)
func ListenUDP(priv *ecdsa.PrivateKey, conn conn, realaddr *net.UDPAddr, unhandled chan ReadPacket, nodeDBPath string, netrestrict *netutil.Netlist) (*Table, error) {
tab, _, err := newUDP(priv, conn, realaddr, unhandled, nodeDBPath, netrestrict)
if err != nil {
return nil, err
}
@ -228,7 +226,7 @@ func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBP
return tab, nil
}
func newUDP(priv *ecdsa.PrivateKey, c conn, natm nat.Interface, nodeDBPath string, netrestrict *netutil.Netlist) (*Table, *udp, error) {
func newUDP(priv *ecdsa.PrivateKey, c conn, realaddr *net.UDPAddr, unhandled chan ReadPacket, nodeDBPath string, netrestrict *netutil.Netlist) (*Table, *udp, error) {
udp := &udp{
conn: c,
priv: priv,
@ -237,16 +235,6 @@ func newUDP(priv *ecdsa.PrivateKey, c conn, natm nat.Interface, nodeDBPath strin
gotreply: make(chan reply),
addpending: make(chan *pending),
}
realaddr := c.LocalAddr().(*net.UDPAddr)
if natm != nil {
if !realaddr.IP.IsLoopback() {
go nat.Map(natm, udp.closing, "udp", realaddr.Port, realaddr.Port, "ethereum discovery")
}
// TODO: react to external IP changes over time.
if ext, err := natm.ExternalIP(); err == nil {
realaddr = &net.UDPAddr{IP: ext, Port: realaddr.Port}
}
}
// TODO: separate TCP port
udp.ourEndpoint = makeEndpoint(realaddr, uint16(realaddr.Port))
tab, err := newTable(udp, PubkeyID(&priv.PublicKey), realaddr, nodeDBPath)
@ -256,7 +244,7 @@ func newUDP(priv *ecdsa.PrivateKey, c conn, natm nat.Interface, nodeDBPath strin
udp.Table = tab
go udp.loop()
go udp.readLoop()
go udp.readLoop(unhandled)
return udp.Table, udp, nil
}
@ -492,8 +480,11 @@ func encodePacket(priv *ecdsa.PrivateKey, ptype byte, req interface{}) ([]byte,
}
// readLoop runs in its own goroutine. it handles incoming UDP packets.
func (t *udp) readLoop() {
func (t *udp) readLoop(unhandled chan ReadPacket) {
defer t.conn.Close()
if unhandled != nil {
defer close(unhandled)
}
// Discovery packets are defined to be no larger than 1280 bytes.
// Packets larger than this size will be cut at the end and treated
// as invalid because their hash won't match.
@ -509,7 +500,12 @@ func (t *udp) readLoop() {
log.Debug("UDP read error", "err", err)
return
}
t.handlePacket(from, buf[:nbytes])
if t.handlePacket(from, buf[:nbytes]) != nil && unhandled != nil {
select {
case unhandled <- ReadPacket{buf[:nbytes], from}:
default:
}
}
}
}

3
p2p/discover/udp_test.go
View file

@ -70,7 +70,8 @@ func newUDPTest(t *testing.T) *udpTest {
remotekey: newkey(),
remoteaddr: &net.UDPAddr{IP: net.IP{10, 0, 1, 99}, Port: 30303},
}
test.table, test.udp, _ = newUDP(test.localkey, test.pipe, nil, "", nil)
realaddr := test.pipe.LocalAddr().(*net.UDPAddr)
test.table, test.udp, _ = newUDP(test.localkey, test.pipe, realaddr, nil, "", nil)
return test
}

3
p2p/discv5/net.go
View file

@ -29,7 +29,6 @@ import (
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/sha3"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/p2p/netutil"
"github.com/ethereum/go-ethereum/rlp"
)
@ -141,7 +140,7 @@ type timeoutEvent struct {
node *Node
}
func newNetwork(conn transport, ourPubkey ecdsa.PublicKey, natm nat.Interface, dbPath string, netrestrict *netutil.Netlist) (*Network, error) {
func newNetwork(conn transport, ourPubkey ecdsa.PublicKey, dbPath string, netrestrict *netutil.Netlist) (*Network, error) {
ourID := PubkeyID(&ourPubkey)
var db *nodeDB

2
p2p/discv5/net_test.go
View file

@ -28,7 +28,7 @@ import (
func TestNetwork_Lookup(t *testing.T) {
key, _ := crypto.GenerateKey()
network, err := newNetwork(lookupTestnet, key.PublicKey, nil, "", nil)
network, err := newNetwork(lookupTestnet, key.PublicKey, "", nil)
if err != nil {
t.Fatal(err)
}

2
p2p/discv5/sim_test.go
View file

@ -282,7 +282,7 @@ func (s *simulation) launchNode(log bool) *Network {
addr := &net.UDPAddr{IP: ip, Port: 30303}
transport := &simTransport{joinTime: time.Now(), sender: id, senderAddr: addr, sim: s, priv: key}
net, err := newNetwork(transport, key.PublicKey, nil, "<no database>", nil)
net, err := newNetwork(transport, key.PublicKey, "<no database>", nil)
if err != nil {
panic("cannot launch new node: " + err.Error())
}

20
p2p/discv5/udp.go
View file

@ -237,12 +237,12 @@ type udp struct {
}
// ListenUDP returns a new table that listens for UDP packets on laddr.
func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string, netrestrict *netutil.Netlist) (*Network, error) {
transport, err := listenUDP(priv, laddr)
func ListenUDP(priv *ecdsa.PrivateKey, conn conn, realaddr *net.UDPAddr, nodeDBPath string, netrestrict *netutil.Netlist) (*Network, error) {
transport, err := listenUDP(priv, conn, realaddr)
if err != nil {
return nil, err
}
net, err := newNetwork(transport, priv.PublicKey, natm, nodeDBPath, netrestrict)
net, err := newNetwork(transport, priv.PublicKey, nodeDBPath, netrestrict)
if err != nil {
return nil, err
}
@ -251,16 +251,8 @@ func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBP
return net, nil
}
func listenUDP(priv *ecdsa.PrivateKey, laddr string) (*udp, error) {
addr, err := net.ResolveUDPAddr("udp", laddr)
if err != nil {
return nil, err
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, err
}
return &udp{conn: conn, priv: priv, ourEndpoint: makeEndpoint(addr, uint16(addr.Port))}, nil
func listenUDP(priv *ecdsa.PrivateKey, conn conn, realaddr *net.UDPAddr) (*udp, error) {
return &udp{conn: conn, priv: priv, ourEndpoint: makeEndpoint(realaddr, uint16(realaddr.Port))}, nil
}
func (t *udp) localAddr() *net.UDPAddr {
@ -376,6 +368,7 @@ func encodePacket(priv *ecdsa.PrivateKey, ptype byte, req interface{}) (p, hash
// add the hash to the front. Note: this doesn't protect the
// packet in any way.
hash = crypto.Keccak256(packet[macSize:])
hash[0]++ // guarantee incompatibility between v4 and temporary v5 packet formats
copy(packet, hash)
return packet, hash, nil
}
@ -422,6 +415,7 @@ func decodePacket(buffer []byte, pkt *ingressPacket) error {
copy(buf, buffer)
hash, sig, sigdata := buf[:macSize], buf[macSize:headSize], buf[headSize:]
shouldhash := crypto.Keccak256(buf[macSize:])
shouldhash[0]++ // guarantee incompatibility between v4 and temporary v5 packet formats
if !bytes.Equal(hash, shouldhash) {
return errBadHash
}

72
p2p/server.go
View file

@ -354,6 +354,32 @@ func (srv *Server) Stop() {
srv.loopWG.Wait()
}
// sharedUDPConn implements a shared connection. Write sends messages to the underlying connection while read returns
// messages that were found unprocessable and sent to the unhandled channel by the primary listener.
type sharedUDPConn struct {
*net.UDPConn
unhandled chan discover.ReadPacket
}
// ReadFromUDP implements discv5.conn
func (s *sharedUDPConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
packet, ok := <-s.unhandled
if !ok {
return 0, nil, fmt.Errorf("Connection was closed")
}
l := len(packet.Data)
if l > len(b) {
l = len(b)
}
copy(b[:l], packet.Data[:l])
return l, packet.Addr, nil
}
// Close implements discv5.conn
func (s *sharedUDPConn) Close() error {
return nil
}
// Start starts running the server.
// Servers can not be re-used after stopping.
func (srv *Server) Start() (err error) {
@ -388,9 +414,43 @@ func (srv *Server) Start() (err error) {
srv.peerOp = make(chan peerOpFunc)
srv.peerOpDone = make(chan struct{})
var (
conn *net.UDPConn
sconn *sharedUDPConn
realaddr *net.UDPAddr
unhandled chan discover.ReadPacket
)
if !srv.NoDiscovery || srv.DiscoveryV5 {
addr, err := net.ResolveUDPAddr("udp", srv.ListenAddr)
if err != nil {
return err
}
conn, err = net.ListenUDP("udp", addr)
if err != nil {
return err
}
realaddr = conn.LocalAddr().(*net.UDPAddr)
if srv.NAT != nil {
if !realaddr.IP.IsLoopback() {
go nat.Map(srv.NAT, srv.quit, "udp", realaddr.Port, realaddr.Port, "ethereum discovery")
}
// TODO: react to external IP changes over time.
if ext, err := srv.NAT.ExternalIP(); err == nil {
realaddr = &net.UDPAddr{IP: ext, Port: realaddr.Port}
}
}
}
if !srv.NoDiscovery && srv.DiscoveryV5 {
unhandled = make(chan discover.ReadPacket, 100)
sconn = &sharedUDPConn{conn, unhandled}
}
// node table
if !srv.NoDiscovery {
ntab, err := discover.ListenUDP(srv.PrivateKey, srv.ListenAddr, srv.NAT, srv.NodeDatabase, srv.NetRestrict)
ntab, err := discover.ListenUDP(srv.PrivateKey, conn, realaddr, unhandled, srv.NodeDatabase, srv.NetRestrict)
if err != nil {
return err
}
@ -401,7 +461,15 @@ func (srv *Server) Start() (err error) {
}
if srv.DiscoveryV5 {
ntab, err := discv5.ListenUDP(srv.PrivateKey, srv.DiscoveryV5Addr, srv.NAT, "", srv.NetRestrict) //srv.NodeDatabase)
var (
ntab *discv5.Network
err error
)
if sconn != nil {
ntab, err = discv5.ListenUDP(srv.PrivateKey, sconn, realaddr, "", srv.NetRestrict) //srv.NodeDatabase)
} else {
ntab, err = discv5.ListenUDP(srv.PrivateKey, conn, realaddr, "", srv.NetRestrict) //srv.NodeDatabase)
}
if err != nil {
return err
}

6
params/bootnodes.go
View file

@ -54,7 +54,7 @@ var RinkebyV5Bootnodes = []string{
// DiscoveryV5Bootnodes are the enode URLs of the P2P bootstrap nodes for the
// experimental RLPx v5 topic-discovery network.
var DiscoveryV5Bootnodes = []string{
"enode://0cc5f5ffb5d9098c8b8c62325f3797f56509bff942704687b6530992ac706e2cb946b90a34f1f19548cd3c7baccbcaea354531e5983c7d1bc0dee16ce4b6440b@40.118.3.223:30305",
"enode://1c7a64d76c0334b0418c004af2f67c50e36a3be60b5e4790bdac0439d21603469a85fad36f2473c9a80eb043ae60936df905fa28f1ff614c3e5dc34f15dcd2dc@40.118.3.223:30308",
"enode://85c85d7143ae8bb96924f2b54f1b3e70d8c4d367af305325d30a61385a432f247d2c75c45c6b4a60335060d072d7f5b35dd1d4c45f76941f62a4f83b6e75daaf@40.118.3.223:30309",
"enode://0cc5f5ffb5d9098c8b8c62325f3797f56509bff942704687b6530992ac706e2cb946b90a34f1f19548cd3c7baccbcaea354531e5983c7d1bc0dee16ce4b6440b@40.118.3.223:30304",
"enode://1c7a64d76c0334b0418c004af2f67c50e36a3be60b5e4790bdac0439d21603469a85fad36f2473c9a80eb043ae60936df905fa28f1ff614c3e5dc34f15dcd2dc@40.118.3.223:30306",
"enode://85c85d7143ae8bb96924f2b54f1b3e70d8c4d367af305325d30a61385a432f247d2c75c45c6b4a60335060d072d7f5b35dd1d4c45f76941f62a4f83b6e75daaf@40.118.3.223:30307",
}