mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-11-14 04:05:17 +00:00
547 lines
16 KiB
Go
547 lines
16 KiB
Go
package identify
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import (
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"context"
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"fmt"
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"net"
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"slices"
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"sort"
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"sync"
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"github.com/libp2p/go-libp2p/core/network"
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ma "github.com/multiformats/go-multiaddr"
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manet "github.com/multiformats/go-multiaddr/net"
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)
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// ActivationThresh sets how many times an address must be seen as "activated"
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// and therefore advertised to other peers as an address that the local peer
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// can be contacted on. The "seen" events expire by default after 40 minutes
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// (OwnObservedAddressTTL * ActivationThreshold). The are cleaned up during
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// the GC rounds set by GCInterval.
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var ActivationThresh = 4
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// observedAddrManagerWorkerChannelSize defines how many addresses can be enqueued
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// for adding to an ObservedAddrManager.
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var observedAddrManagerWorkerChannelSize = 16
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const maxExternalThinWaistAddrsPerLocalAddr = 3
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// thinWaist is a struct that stores the address along with it's thin waist prefix and rest of the multiaddr
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type thinWaist struct {
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Addr, TW, Rest ma.Multiaddr
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}
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// thinWaistWithCount is a thinWaist along with the count of the connection that have it as the local address
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type thinWaistWithCount struct {
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thinWaist
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Count int
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}
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func thinWaistForm(a ma.Multiaddr) (thinWaist, error) {
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i := 0
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tw, rest := ma.SplitFunc(a, func(c ma.Component) bool {
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if i > 1 {
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return true
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}
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switch i {
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case 0:
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if c.Protocol().Code == ma.P_IP4 || c.Protocol().Code == ma.P_IP6 {
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i++
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return false
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}
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return true
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case 1:
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if c.Protocol().Code == ma.P_TCP || c.Protocol().Code == ma.P_UDP {
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i++
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return false
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}
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return true
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}
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return false
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})
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if i <= 1 {
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return thinWaist{}, fmt.Errorf("not a thinwaist address: %s", a)
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}
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return thinWaist{Addr: a, TW: tw, Rest: rest}, nil
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}
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// getObserver returns the observer for the multiaddress
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// For an IPv4 multiaddress the observer is the IP address
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// For an IPv6 multiaddress the observer is the first /56 prefix of the IP address
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func getObserver(a ma.Multiaddr) (string, error) {
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ip, err := manet.ToIP(a)
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if err != nil {
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return "", err
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}
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if ip4 := ip.To4(); ip4 != nil {
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return ip4.String(), nil
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}
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// Count /56 prefix as a single observer.
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return ip.Mask(net.CIDRMask(56, 128)).String(), nil
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}
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// connMultiaddrs provides IsClosed along with network.ConnMultiaddrs. It is easier to mock this than network.Conn
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type connMultiaddrs interface {
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network.ConnMultiaddrs
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IsClosed() bool
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}
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// observerSetCacheSize is the number of transport sharing the same thinwaist (tcp, ws, wss), (quic, webtransport, webrtc-direct)
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// This is 3 in practice right now, but keep a buffer of 3 extra elements
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const observerSetCacheSize = 5
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// observerSet is the set of observers who have observed ThinWaistAddr
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type observerSet struct {
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ObservedTWAddr ma.Multiaddr
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ObservedBy map[string]int
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mu sync.RWMutex // protects following
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cachedMultiaddrs map[string]ma.Multiaddr // cache of localMultiaddr rest(addr - thinwaist) => output multiaddr
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}
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func (s *observerSet) cacheMultiaddr(addr ma.Multiaddr) ma.Multiaddr {
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if addr == nil {
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return s.ObservedTWAddr
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}
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addrStr := string(addr.Bytes())
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s.mu.RLock()
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res, ok := s.cachedMultiaddrs[addrStr]
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s.mu.RUnlock()
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if ok {
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return res
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}
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s.mu.Lock()
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defer s.mu.Unlock()
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// Check if some other go routine added this while we were waiting
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res, ok = s.cachedMultiaddrs[addrStr]
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if ok {
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return res
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}
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if s.cachedMultiaddrs == nil {
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s.cachedMultiaddrs = make(map[string]ma.Multiaddr, observerSetCacheSize)
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}
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if len(s.cachedMultiaddrs) == observerSetCacheSize {
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// remove one entry if we will go over the limit
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for k := range s.cachedMultiaddrs {
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delete(s.cachedMultiaddrs, k)
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break
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}
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}
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s.cachedMultiaddrs[addrStr] = ma.Join(s.ObservedTWAddr, addr)
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return s.cachedMultiaddrs[addrStr]
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}
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type observation struct {
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conn connMultiaddrs
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observed ma.Multiaddr
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}
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// ObservedAddrManager maps connection's local multiaddrs to their externally observable multiaddress
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type ObservedAddrManager struct {
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// Our listen addrs
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listenAddrs func() []ma.Multiaddr
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// Our listen addrs with interface addrs for unspecified addrs
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interfaceListenAddrs func() ([]ma.Multiaddr, error)
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// All host addrs
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hostAddrs func() []ma.Multiaddr
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// Any normalization required before comparing. Useful to remove certhash
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normalize func(ma.Multiaddr) ma.Multiaddr
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// worker channel for new observations
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wch chan observation
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// notified on recording an observation
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addrRecordedNotif chan struct{}
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// for closing
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wg sync.WaitGroup
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ctx context.Context
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ctxCancel context.CancelFunc
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mu sync.RWMutex
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// local thin waist => external thin waist => observerSet
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externalAddrs map[string]map[string]*observerSet
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// connObservedTWAddrs maps the connection to the last observed thin waist multiaddr on that connection
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connObservedTWAddrs map[connMultiaddrs]ma.Multiaddr
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// localMultiaddr => thin waist form with the count of the connections the multiaddr
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// was seen on for tracking our local listen addresses
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localAddrs map[string]*thinWaistWithCount
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}
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// NewObservedAddrManager returns a new address manager using peerstore.OwnObservedAddressTTL as the TTL.
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func NewObservedAddrManager(listenAddrs, hostAddrs func() []ma.Multiaddr,
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interfaceListenAddrs func() ([]ma.Multiaddr, error), normalize func(ma.Multiaddr) ma.Multiaddr) (*ObservedAddrManager, error) {
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if normalize == nil {
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normalize = func(addr ma.Multiaddr) ma.Multiaddr { return addr }
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}
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o := &ObservedAddrManager{
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externalAddrs: make(map[string]map[string]*observerSet),
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connObservedTWAddrs: make(map[connMultiaddrs]ma.Multiaddr),
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localAddrs: make(map[string]*thinWaistWithCount),
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wch: make(chan observation, observedAddrManagerWorkerChannelSize),
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addrRecordedNotif: make(chan struct{}, 1),
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listenAddrs: listenAddrs,
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interfaceListenAddrs: interfaceListenAddrs,
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hostAddrs: hostAddrs,
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normalize: normalize,
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}
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o.ctx, o.ctxCancel = context.WithCancel(context.Background())
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o.wg.Add(1)
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go o.worker()
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return o, nil
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}
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// AddrsFor return all activated observed addresses associated with the given
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// (resolved) listen address.
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func (o *ObservedAddrManager) AddrsFor(addr ma.Multiaddr) (addrs []ma.Multiaddr) {
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if addr == nil {
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return nil
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}
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o.mu.RLock()
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defer o.mu.RUnlock()
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tw, err := thinWaistForm(o.normalize(addr))
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if err != nil {
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return nil
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}
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observerSets := o.getTopExternalAddrs(string(tw.TW.Bytes()))
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res := make([]ma.Multiaddr, 0, len(observerSets))
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for _, s := range observerSets {
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res = append(res, s.cacheMultiaddr(tw.Rest))
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}
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return res
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}
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// Addrs return all activated observed addresses
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func (o *ObservedAddrManager) Addrs() []ma.Multiaddr {
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o.mu.RLock()
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defer o.mu.RUnlock()
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m := make(map[string][]*observerSet)
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for localTWStr := range o.externalAddrs {
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m[localTWStr] = append(m[localTWStr], o.getTopExternalAddrs(localTWStr)...)
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}
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addrs := make([]ma.Multiaddr, 0, maxExternalThinWaistAddrsPerLocalAddr*5) // assume 5 transports
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for _, t := range o.localAddrs {
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for _, s := range m[string(t.TW.Bytes())] {
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addrs = append(addrs, s.cacheMultiaddr(t.Rest))
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}
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}
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return addrs
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}
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func (o *ObservedAddrManager) getTopExternalAddrs(localTWStr string) []*observerSet {
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observerSets := make([]*observerSet, 0, len(o.externalAddrs[localTWStr]))
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for _, v := range o.externalAddrs[localTWStr] {
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if len(v.ObservedBy) >= ActivationThresh {
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observerSets = append(observerSets, v)
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}
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}
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slices.SortFunc(observerSets, func(a, b *observerSet) int {
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diff := len(b.ObservedBy) - len(a.ObservedBy)
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if diff != 0 {
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return diff
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}
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// In case we have elements with equal counts,
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// keep the address list stable by using the lexicographically smaller address
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as := a.ObservedTWAddr.String()
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bs := b.ObservedTWAddr.String()
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if as < bs {
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return -1
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} else if as > bs {
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return 1
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} else {
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return 0
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}
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})
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n := len(observerSets)
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if n > maxExternalThinWaistAddrsPerLocalAddr {
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n = maxExternalThinWaistAddrsPerLocalAddr
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}
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return observerSets[:n]
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}
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// Record enqueues an observation for recording
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func (o *ObservedAddrManager) Record(conn connMultiaddrs, observed ma.Multiaddr) {
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select {
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case o.wch <- observation{
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conn: conn,
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observed: observed,
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}:
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default:
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log.Debugw("dropping address observation due to full buffer",
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"from", conn.RemoteMultiaddr(),
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"observed", observed,
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)
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}
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}
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func (o *ObservedAddrManager) worker() {
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defer o.wg.Done()
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for {
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select {
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case obs := <-o.wch:
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o.maybeRecordObservation(obs.conn, obs.observed)
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case <-o.ctx.Done():
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return
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}
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}
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}
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func (o *ObservedAddrManager) shouldRecordObservation(conn connMultiaddrs, observed ma.Multiaddr) (shouldRecord bool, localTW thinWaist, observedTW thinWaist) {
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if conn == nil || observed == nil {
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return false, thinWaist{}, thinWaist{}
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}
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// Ignore observations from loopback nodes. We already know our loopback
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// addresses.
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if manet.IsIPLoopback(observed) {
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return false, thinWaist{}, thinWaist{}
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}
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// Provided by NAT64 peers, these addresses are specific to the peer and not publicly routable
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if manet.IsNAT64IPv4ConvertedIPv6Addr(observed) {
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return false, thinWaist{}, thinWaist{}
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}
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// we should only use ObservedAddr when our connection's LocalAddr is one
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// of our ListenAddrs. If we Dial out using an ephemeral addr, knowing that
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// address's external mapping is not very useful because the port will not be
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// the same as the listen addr.
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ifaceaddrs, err := o.interfaceListenAddrs()
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if err != nil {
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log.Infof("failed to get interface listen addrs", err)
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return false, thinWaist{}, thinWaist{}
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}
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for i, a := range ifaceaddrs {
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ifaceaddrs[i] = o.normalize(a)
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}
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local := o.normalize(conn.LocalMultiaddr())
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listenAddrs := o.listenAddrs()
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for i, a := range listenAddrs {
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listenAddrs[i] = o.normalize(a)
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}
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if !ma.Contains(ifaceaddrs, local) && !ma.Contains(listenAddrs, local) {
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// not in our list
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return false, thinWaist{}, thinWaist{}
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}
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localTW, err = thinWaistForm(local)
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if err != nil {
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return false, thinWaist{}, thinWaist{}
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}
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observedTW, err = thinWaistForm(o.normalize(observed))
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if err != nil {
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return false, thinWaist{}, thinWaist{}
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}
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hostAddrs := o.hostAddrs()
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for i, a := range hostAddrs {
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hostAddrs[i] = o.normalize(a)
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}
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// We should reject the connection if the observation doesn't match the
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// transports of one of our advertised addresses.
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if !HasConsistentTransport(observed, hostAddrs) &&
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!HasConsistentTransport(observed, listenAddrs) {
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log.Debugw(
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"observed multiaddr doesn't match the transports of any announced addresses",
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"from", conn.RemoteMultiaddr(),
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"observed", observed,
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)
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return false, thinWaist{}, thinWaist{}
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}
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return true, localTW, observedTW
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}
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func (o *ObservedAddrManager) maybeRecordObservation(conn connMultiaddrs, observed ma.Multiaddr) {
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shouldRecord, localTW, observedTW := o.shouldRecordObservation(conn, observed)
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if !shouldRecord {
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return
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}
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log.Debugw("added own observed listen addr", "observed", observed)
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o.mu.Lock()
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defer o.mu.Unlock()
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o.recordObservationUnlocked(conn, localTW, observedTW)
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select {
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case o.addrRecordedNotif <- struct{}{}:
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default:
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}
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}
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func (o *ObservedAddrManager) recordObservationUnlocked(conn connMultiaddrs, localTW, observedTW thinWaist) {
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if conn.IsClosed() {
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// dont record if the connection is already closed. Any previous observations will be removed in
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// the disconnected callback
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return
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}
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localTWStr := string(localTW.TW.Bytes())
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observedTWStr := string(observedTW.TW.Bytes())
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observer, err := getObserver(conn.RemoteMultiaddr())
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if err != nil {
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return
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}
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prevObservedTWAddr, ok := o.connObservedTWAddrs[conn]
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if !ok {
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t, ok := o.localAddrs[string(localTW.Addr.Bytes())]
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if !ok {
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t = &thinWaistWithCount{
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thinWaist: localTW,
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}
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o.localAddrs[string(localTW.Addr.Bytes())] = t
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}
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t.Count++
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} else {
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if prevObservedTWAddr.Equal(observedTW.TW) {
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// we have received the same observation again, nothing to do
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return
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}
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// if we have a previous entry remove it from externalAddrs
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o.removeExternalAddrsUnlocked(observer, localTWStr, string(prevObservedTWAddr.Bytes()))
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// no need to change the localAddrs map here
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}
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o.connObservedTWAddrs[conn] = observedTW.TW
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o.addExternalAddrsUnlocked(observedTW.TW, observer, localTWStr, observedTWStr)
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}
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func (o *ObservedAddrManager) removeExternalAddrsUnlocked(observer, localTWStr, observedTWStr string) {
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s, ok := o.externalAddrs[localTWStr][observedTWStr]
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if !ok {
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return
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}
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s.ObservedBy[observer]--
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if s.ObservedBy[observer] <= 0 {
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delete(s.ObservedBy, observer)
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}
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if len(s.ObservedBy) == 0 {
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delete(o.externalAddrs[localTWStr], observedTWStr)
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}
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if len(o.externalAddrs[localTWStr]) == 0 {
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delete(o.externalAddrs, localTWStr)
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}
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}
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func (o *ObservedAddrManager) addExternalAddrsUnlocked(observedTWAddr ma.Multiaddr, observer, localTWStr, observedTWStr string) {
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s, ok := o.externalAddrs[localTWStr][observedTWStr]
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if !ok {
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s = &observerSet{
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ObservedTWAddr: observedTWAddr,
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ObservedBy: make(map[string]int),
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}
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if _, ok := o.externalAddrs[localTWStr]; !ok {
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o.externalAddrs[localTWStr] = make(map[string]*observerSet)
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}
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o.externalAddrs[localTWStr][observedTWStr] = s
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}
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s.ObservedBy[observer]++
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}
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func (o *ObservedAddrManager) removeConn(conn connMultiaddrs) {
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if conn == nil {
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return
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}
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o.mu.Lock()
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defer o.mu.Unlock()
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// normalize before obtaining the thinWaist so that we are always dealing
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// with the normalized form of the address
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localTW, err := thinWaistForm(o.normalize(conn.LocalMultiaddr()))
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if err != nil {
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return
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}
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t, ok := o.localAddrs[string(localTW.Addr.Bytes())]
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if !ok {
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return
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}
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t.Count--
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if t.Count <= 0 {
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delete(o.localAddrs, string(localTW.Addr.Bytes()))
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}
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observedTWAddr, ok := o.connObservedTWAddrs[conn]
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if !ok {
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return
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}
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delete(o.connObservedTWAddrs, conn)
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observer, err := getObserver(conn.RemoteMultiaddr())
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if err != nil {
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return
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}
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o.removeExternalAddrsUnlocked(observer, string(localTW.TW.Bytes()), string(observedTWAddr.Bytes()))
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select {
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case o.addrRecordedNotif <- struct{}{}:
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default:
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}
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}
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func (o *ObservedAddrManager) getNATType() (tcpNATType, udpNATType network.NATDeviceType) {
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o.mu.RLock()
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defer o.mu.RUnlock()
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var tcpCounts, udpCounts []int
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var tcpTotal, udpTotal int
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for _, m := range o.externalAddrs {
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isTCP := false
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for _, v := range m {
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if _, err := v.ObservedTWAddr.ValueForProtocol(ma.P_TCP); err == nil {
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isTCP = true
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}
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break
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}
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for _, v := range m {
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if isTCP {
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tcpCounts = append(tcpCounts, len(v.ObservedBy))
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tcpTotal += len(v.ObservedBy)
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} else {
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udpCounts = append(udpCounts, len(v.ObservedBy))
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udpTotal += len(v.ObservedBy)
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}
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}
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}
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sort.Sort(sort.Reverse(sort.IntSlice(tcpCounts)))
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sort.Sort(sort.Reverse(sort.IntSlice(udpCounts)))
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tcpTopCounts, udpTopCounts := 0, 0
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for i := 0; i < maxExternalThinWaistAddrsPerLocalAddr && i < len(tcpCounts); i++ {
|
|
tcpTopCounts += tcpCounts[i]
|
|
}
|
|
for i := 0; i < maxExternalThinWaistAddrsPerLocalAddr && i < len(udpCounts); i++ {
|
|
udpTopCounts += udpCounts[i]
|
|
}
|
|
|
|
// If the top elements cover more than 1/2 of all the observations, there's a > 50% chance that
|
|
// hole punching based on outputs of observed address manager will succeed
|
|
if tcpTotal >= 3*maxExternalThinWaistAddrsPerLocalAddr {
|
|
if tcpTopCounts >= tcpTotal/2 {
|
|
tcpNATType = network.NATDeviceTypeCone
|
|
} else {
|
|
tcpNATType = network.NATDeviceTypeSymmetric
|
|
}
|
|
}
|
|
if udpTotal >= 3*maxExternalThinWaistAddrsPerLocalAddr {
|
|
if udpTopCounts >= udpTotal/2 {
|
|
udpNATType = network.NATDeviceTypeCone
|
|
} else {
|
|
udpNATType = network.NATDeviceTypeSymmetric
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (o *ObservedAddrManager) Close() error {
|
|
o.ctxCancel()
|
|
o.wg.Wait()
|
|
return nil
|
|
}
|