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p2p, p2p/discover: add signed ENR generation (#17753)

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This PR adds enode.LocalNode and integrates it into the p2p
subsystem. This new object is the keeper of the local node
record. For now, a new version of the record is produced every
time the client restarts. We'll make it smarter to avoid that in
the future.

There are a couple of other changes in this commit: discovery now
waits for all of its goroutines at shutdown and the p2p server
now closes the node database after discovery has shut down. This
fixes a leveldb crash in tests. p2p server startup is faster
because it doesn't need to wait for the external IP query
anymore.
This commit is contained in:
Felix Lange
2018-10-12 11:47:24 +02:00
committed by GitHub
parent dcae0d348b
commit 6f607de5d5
24 changed files with 979 additions and 278 deletions
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92
p2p/discover/udp.go
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@@ -23,12 +23,12 @@ import (
"errors"
"fmt"
"net"
"sync"
"time"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/p2p/netutil"
"github.com/ethereum/go-ethereum/rlp"
)
@@ -118,9 +118,11 @@ type (
)
func makeEndpoint(addr *net.UDPAddr, tcpPort uint16) rpcEndpoint {
ip := addr.IP.To4()
if ip == nil {
ip = addr.IP.To16()
ip := net.IP{}
if ip4 := addr.IP.To4(); ip4 != nil {
ip = ip4
} else if ip6 := addr.IP.To16(); ip6 != nil {
ip = ip6
}
return rpcEndpoint{IP: ip, UDP: uint16(addr.Port), TCP: tcpPort}
}
@@ -165,20 +167,19 @@ type conn interface {
LocalAddr() net.Addr
}
// udp implements the RPC protocol.
// udp implements the discovery v4 UDP wire protocol.
type udp struct {
conn conn
netrestrict *netutil.Netlist
priv *ecdsa.PrivateKey
ourEndpoint rpcEndpoint
localNode *enode.LocalNode
db *enode.DB
tab *Table
wg sync.WaitGroup
addpending chan *pending
gotreply chan reply
closing chan struct{}
nat nat.Interface
*Table
closing chan struct{}
}
// pending represents a pending reply.
@@ -230,60 +231,57 @@ type Config struct {
PrivateKey *ecdsa.PrivateKey
// These settings are optional:
AnnounceAddr *net.UDPAddr // local address announced in the DHT
NodeDBPath string // if set, the node database is stored at this filesystem location
NetRestrict *netutil.Netlist // network whitelist
Bootnodes []*enode.Node // list of bootstrap nodes
Unhandled chan<- ReadPacket // unhandled packets are sent on this channel
NetRestrict *netutil.Netlist // network whitelist
Bootnodes []*enode.Node // list of bootstrap nodes
Unhandled chan<- ReadPacket // unhandled packets are sent on this channel
}
// ListenUDP returns a new table that listens for UDP packets on laddr.
func ListenUDP(c conn, cfg Config) (*Table, error) {
tab, _, err := newUDP(c, cfg)
func ListenUDP(c conn, ln *enode.LocalNode, cfg Config) (*Table, error) {
tab, _, err := newUDP(c, ln, cfg)
if err != nil {
return nil, err
}
log.Info("UDP listener up", "self", tab.self)
return tab, nil
}
func newUDP(c conn, cfg Config) (*Table, *udp, error) {
realaddr := c.LocalAddr().(*net.UDPAddr)
if cfg.AnnounceAddr != nil {
realaddr = cfg.AnnounceAddr
}
self := enode.NewV4(&cfg.PrivateKey.PublicKey, realaddr.IP, realaddr.Port, realaddr.Port)
db, err := enode.OpenDB(cfg.NodeDBPath)
if err != nil {
return nil, nil, err
}
func newUDP(c conn, ln *enode.LocalNode, cfg Config) (*Table, *udp, error) {
udp := &udp{
conn: c,
priv: cfg.PrivateKey,
netrestrict: cfg.NetRestrict,
localNode: ln,
db: ln.Database(),
closing: make(chan struct{}),
gotreply: make(chan reply),
addpending: make(chan *pending),
}
// TODO: separate TCP port
udp.ourEndpoint = makeEndpoint(realaddr, uint16(realaddr.Port))
tab, err := newTable(udp, self, db, cfg.Bootnodes)
tab, err := newTable(udp, ln.Database(), cfg.Bootnodes)
if err != nil {
return nil, nil, err
}
udp.Table = tab
udp.tab = tab
udp.wg.Add(2)
go udp.loop()
go udp.readLoop(cfg.Unhandled)
return udp.Table, udp, nil
return udp.tab, udp, nil
}
func (t *udp) self() *enode.Node {
return t.localNode.Node()
}
func (t *udp) close() {
close(t.closing)
t.conn.Close()
t.db.Close()
// TODO: wait for the loops to end.
t.wg.Wait()
}
func (t *udp) ourEndpoint() rpcEndpoint {
n := t.self()
a := &net.UDPAddr{IP: n.IP(), Port: n.UDP()}
return makeEndpoint(a, uint16(n.TCP()))
}
// ping sends a ping message to the given node and waits for a reply.
@@ -296,7 +294,7 @@ func (t *udp) ping(toid enode.ID, toaddr *net.UDPAddr) error {
func (t *udp) sendPing(toid enode.ID, toaddr *net.UDPAddr, callback func()) <-chan error {
req := &ping{
Version: 4,
From: t.ourEndpoint,
From: t.ourEndpoint(),
To: makeEndpoint(toaddr, 0), // TODO: maybe use known TCP port from DB
Expiration: uint64(time.Now().Add(expiration).Unix()),
}
@@ -313,6 +311,7 @@ func (t *udp) sendPing(toid enode.ID, toaddr *net.UDPAddr, callback func()) <-ch
}
return ok
})
t.localNode.UDPContact(toaddr)
t.write(toaddr, req.name(), packet)
return errc
}
@@ -381,6 +380,8 @@ func (t *udp) handleReply(from enode.ID, ptype byte, req packet) bool {
// loop runs in its own goroutine. it keeps track of
// the refresh timer and the pending reply queue.
func (t *udp) loop() {
defer t.wg.Done()
var (
plist = list.New()
timeout = time.NewTimer(0)
@@ -542,10 +543,11 @@ func encodePacket(priv *ecdsa.PrivateKey, ptype byte, req interface{}) (packet,
// readLoop runs in its own goroutine. it handles incoming UDP packets.
func (t *udp) readLoop(unhandled chan<- ReadPacket) {
defer t.conn.Close()
defer t.wg.Done()
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.
@@ -629,10 +631,11 @@ func (req *ping) handle(t *udp, from *net.UDPAddr, fromKey encPubkey, mac []byte
n := wrapNode(enode.NewV4(key, from.IP, int(req.From.TCP), from.Port))
t.handleReply(n.ID(), pingPacket, req)
if time.Since(t.db.LastPongReceived(n.ID())) > bondExpiration {
t.sendPing(n.ID(), from, func() { t.addThroughPing(n) })
t.sendPing(n.ID(), from, func() { t.tab.addThroughPing(n) })
} else {
t.addThroughPing(n)
t.tab.addThroughPing(n)
}
t.localNode.UDPEndpointStatement(from, &net.UDPAddr{IP: req.To.IP, Port: int(req.To.UDP)})
t.db.UpdateLastPingReceived(n.ID(), time.Now())
return nil
}
@@ -647,6 +650,7 @@ func (req *pong) handle(t *udp, from *net.UDPAddr, fromKey encPubkey, mac []byte
if !t.handleReply(fromID, pongPacket, req) {
return errUnsolicitedReply
}
t.localNode.UDPEndpointStatement(from, &net.UDPAddr{IP: req.To.IP, Port: int(req.To.UDP)})
t.db.UpdateLastPongReceived(fromID, time.Now())
return nil
}
@@ -668,9 +672,9 @@ func (req *findnode) handle(t *udp, from *net.UDPAddr, fromKey encPubkey, mac []
return errUnknownNode
}
target := enode.ID(crypto.Keccak256Hash(req.Target[:]))
t.mutex.Lock()
closest := t.closest(target, bucketSize).entries
t.mutex.Unlock()
t.tab.mutex.Lock()
closest := t.tab.closest(target, bucketSize).entries
t.tab.mutex.Unlock()
p := neighbors{Expiration: uint64(time.Now().Add(expiration).Unix())}
var sent bool