p2p/enode: improve IPv6 support, add ENR text representation (#19663)
* p2p/enr: add entries for for IPv4/IPv6 separation This adds entry types for "ip6", "udp6", "tcp6" keys. The IP type stays around because removing it would break a lot of code and force everyone to care about the distinction. * p2p/enode: track IPv4 and IPv6 address separately LocalNode predicts the local node's UDP endpoint and updates the record. This change makes it predict IPv4 and IPv6 endpoints separately since they can now be in the record at the same time. * p2p/enode: implement base64 text format * all: switch to enode.Parse(...) This allows passing base64-encoded node records to all the places that previously accepted enode:// URLs. The URL format is still supported. * cmd/bootnode, p2p: log node URL instead of ENR ...and return the base64 record in NodeInfo.
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@@ -48,23 +48,32 @@ type LocalNode struct {
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db *DB
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// everything below is protected by a lock
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mu sync.Mutex
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seq uint64
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entries map[string]enr.Entry
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udpTrack *netutil.IPTracker // predicts external UDP endpoint
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staticIP net.IP
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fallbackIP net.IP
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fallbackUDP int
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mu sync.Mutex
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seq uint64
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entries map[string]enr.Entry
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endpoint4 lnEndpoint
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endpoint6 lnEndpoint
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}
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type lnEndpoint struct {
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track *netutil.IPTracker
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staticIP, fallbackIP net.IP
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fallbackUDP int
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}
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// NewLocalNode creates a local node.
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func NewLocalNode(db *DB, key *ecdsa.PrivateKey) *LocalNode {
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ln := &LocalNode{
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id: PubkeyToIDV4(&key.PublicKey),
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db: db,
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key: key,
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udpTrack: netutil.NewIPTracker(iptrackWindow, iptrackContactWindow, iptrackMinStatements),
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entries: make(map[string]enr.Entry),
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id: PubkeyToIDV4(&key.PublicKey),
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db: db,
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key: key,
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entries: make(map[string]enr.Entry),
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endpoint4: lnEndpoint{
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track: netutil.NewIPTracker(iptrackWindow, iptrackContactWindow, iptrackMinStatements),
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},
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endpoint6: lnEndpoint{
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track: netutil.NewIPTracker(iptrackWindow, iptrackContactWindow, iptrackMinStatements),
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},
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}
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ln.seq = db.localSeq(ln.id)
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ln.invalidate()
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@@ -89,13 +98,22 @@ func (ln *LocalNode) Node() *Node {
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return ln.cur.Load().(*Node)
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}
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// Seq returns the current sequence number of the local node record.
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func (ln *LocalNode) Seq() uint64 {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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return ln.seq
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}
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// ID returns the local node ID.
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func (ln *LocalNode) ID() ID {
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return ln.id
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}
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// Set puts the given entry into the local record, overwriting
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// any existing value.
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// Set puts the given entry into the local record, overwriting any existing value.
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// Use Set*IP and SetFallbackUDP to set IP addresses and UDP port, otherwise they'll
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// be overwritten by the endpoint predictor.
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func (ln *LocalNode) Set(e enr.Entry) {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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@@ -127,13 +145,20 @@ func (ln *LocalNode) delete(e enr.Entry) {
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}
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}
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func (ln *LocalNode) endpointForIP(ip net.IP) *lnEndpoint {
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if ip.To4() != nil {
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return &ln.endpoint4
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}
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return &ln.endpoint6
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}
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// SetStaticIP sets the local IP to the given one unconditionally.
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// This disables endpoint prediction.
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func (ln *LocalNode) SetStaticIP(ip net.IP) {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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ln.staticIP = ip
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ln.endpointForIP(ip).staticIP = ip
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ln.updateEndpoints()
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}
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@@ -143,17 +168,18 @@ func (ln *LocalNode) SetFallbackIP(ip net.IP) {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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ln.fallbackIP = ip
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ln.endpointForIP(ip).fallbackIP = ip
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ln.updateEndpoints()
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}
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// SetFallbackUDP sets the last-resort UDP port. This port is used
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// SetFallbackUDP sets the last-resort UDP-on-IPv4 port. This port is used
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// if no endpoint prediction can be made.
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func (ln *LocalNode) SetFallbackUDP(port int) {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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ln.fallbackUDP = port
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ln.endpoint4.fallbackUDP = port
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ln.endpoint6.fallbackUDP = port
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ln.updateEndpoints()
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}
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@@ -163,7 +189,7 @@ func (ln *LocalNode) UDPEndpointStatement(fromaddr, endpoint *net.UDPAddr) {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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ln.udpTrack.AddStatement(fromaddr.String(), endpoint.String())
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ln.endpointForIP(endpoint.IP).track.AddStatement(fromaddr.String(), endpoint.String())
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ln.updateEndpoints()
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}
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@@ -173,32 +199,50 @@ func (ln *LocalNode) UDPContact(toaddr *net.UDPAddr) {
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ln.mu.Lock()
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defer ln.mu.Unlock()
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ln.udpTrack.AddContact(toaddr.String())
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ln.endpointForIP(toaddr.IP).track.AddContact(toaddr.String())
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ln.updateEndpoints()
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}
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// updateEndpoints updates the record with predicted endpoints.
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func (ln *LocalNode) updateEndpoints() {
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// Determine the endpoints.
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newIP := ln.fallbackIP
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newUDP := ln.fallbackUDP
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if ln.staticIP != nil {
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newIP = ln.staticIP
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} else if ip, port := predictAddr(ln.udpTrack); ip != nil {
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newIP = ip
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newUDP = port
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}
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ip4, udp4 := ln.endpoint4.get()
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ip6, udp6 := ln.endpoint6.get()
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// Update the record.
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if newIP != nil && !newIP.IsUnspecified() {
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ln.set(enr.IP(newIP))
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if newUDP != 0 {
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ln.set(enr.UDP(newUDP))
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} else {
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ln.delete(enr.UDP(0))
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}
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if ip4 != nil && !ip4.IsUnspecified() {
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ln.set(enr.IPv4(ip4))
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} else {
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ln.delete(enr.IP{})
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ln.delete(enr.IPv4{})
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}
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if ip6 != nil && !ip6.IsUnspecified() {
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ln.set(enr.IPv6(ip6))
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} else {
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ln.delete(enr.IPv6{})
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}
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if udp4 != 0 {
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ln.set(enr.UDP(udp4))
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} else {
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ln.delete(enr.UDP(0))
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}
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if udp6 != 0 && udp6 != udp4 {
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ln.set(enr.UDP6(udp6))
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} else {
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ln.delete(enr.UDP6(0))
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}
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}
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// get returns the endpoint with highest precedence.
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func (e *lnEndpoint) get() (newIP net.IP, newPort int) {
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newPort = e.fallbackUDP
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if e.fallbackIP != nil {
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newIP = e.fallbackIP
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}
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if e.staticIP != nil {
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newIP = e.staticIP
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} else if ip, port := predictAddr(e.track); ip != nil {
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newIP = ip
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newPort = port
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}
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return newIP, newPort
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}
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// predictAddr wraps IPTracker.PredictEndpoint, converting from its string-based
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