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Support dual-stacked peers

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This commit is contained in:
Justin Li 2014-07-23 13:15:04 -04:00
parent 14843b9e89
commit b227fc1fcd
6 changed files with 91 additions and 60 deletions
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48
http/query/query.go
View file

@ -121,38 +121,53 @@ func (q Query) RequestedPeerCount(fallback int) int {
return fallback
}
func getIPs(ipstr string, ipv4, ipv6 net.IP) (net.IP, net.IP, bool) {
if ip := net.ParseIP(ipstr); ip != nil {
newIPv4 := ip.To4()
if ipv4 == nil && newIPv4 != nil {
ipv4 = newIPv4
} else if ipv6 == nil && newIPv4 == nil {
ipv6 = ip
}
}
return ipv4, ipv6, ipv4 != nil && ipv6 != nil
}
// RequestedIP returns the requested IP address from a Query.
func (q Query) RequestedIP(r *http.Request, allowSpoofing bool) (net.IP, error) {
func (q Query) RequestedIP(r *http.Request, allowSpoofing bool) (ipv4, ipv6 net.IP, err error) {
var done bool
if allowSpoofing {
if ipstr, ok := q.Params["ip"]; ok {
if ip := net.ParseIP(ipstr); ip != nil {
return ip, nil
}
ipv4, ipv6, done = getIPs(ipstr, ipv4, ipv6)
}
if ipstr, ok := q.Params["ipv4"]; ok {
if ip := net.ParseIP(ipstr); ip != nil {
return ip, nil
if ipv4, ipv6, done = getIPs(ipstr, ipv4, ipv6); done {
return
}
}
if ipstr, ok := q.Params["ipv6"]; ok {
if ip := net.ParseIP(ipstr); ip != nil {
return ip, nil
if ipv4, ipv6, done = getIPs(ipstr, ipv4, ipv6); done {
return
}
}
}
if xRealIPs, ok := q.Params["x-real-ip"]; ok {
if ip := net.ParseIP(string(xRealIPs[0])); ip != nil {
return ip, nil
if ipv4, ipv6, done = getIPs(string(xRealIPs[0]), ipv4, ipv6); done {
return
}
}
if r.RemoteAddr == "" {
if ip := net.ParseIP("127.0.0.1"); ip != nil {
return ip, nil
if ipv4 == nil {
ipv4 = net.ParseIP("127.0.0.1")
}
return
}
portIndex := len(r.RemoteAddr) - 1
@ -164,10 +179,13 @@ func (q Query) RequestedIP(r *http.Request, allowSpoofing bool) (net.IP, error)
if portIndex != -1 {
ipstr := r.RemoteAddr[0:portIndex]
if ip := net.ParseIP(ipstr); ip != nil {
return ip, nil
if ipv4, ipv6, done = getIPs(ipstr, ipv4, ipv6); done {
return
}
}
return nil, errors.New("failed to parse IP address")
if ipv4 == nil && ipv6 == nil {
err = errors.New("failed to parse IP address")
}
return
}

5
http/tracker.go
View file

@ -35,7 +35,7 @@ func NewAnnounce(cfg *config.Config, r *http.Request, p httprouter.Params) (*mod
return nil, models.ErrMalformedRequest
}
ip, err := q.RequestedIP(r, cfg.AllowIPSpoofing)
ipv4, ipv6, err := q.RequestedIP(r, cfg.AllowIPSpoofing)
if err != nil {
return nil, models.ErrMalformedRequest
}
@ -65,7 +65,8 @@ func NewAnnounce(cfg *config.Config, r *http.Request, p httprouter.Params) (*mod
Compact: compact,
Downloaded: downloaded,
Event: event,
IP: ip,
IPv4: ipv4,
IPv6: ipv6,
Infohash: infohash,
Left: left,
NumWant: numWant,

28
http/writer.go
View file

@ -70,17 +70,13 @@ func compactPeers(ipv6 bool, peers models.PeerList) []byte {
if ipv6 {
for _, peer := range peers {
if ip := peer.IP.To16(); ip != nil {
compactPeers.Write(ip)
compactPeers.Write([]byte{byte(peer.Port >> 8), byte(peer.Port & 0xff)})
}
compactPeers.Write(peer.IPv6)
compactPeers.Write([]byte{byte(peer.Port >> 8), byte(peer.Port & 0xff)})
}
} else {
for _, peer := range peers {
if ip := peer.IP.To4(); ip != nil {
compactPeers.Write(ip)
compactPeers.Write([]byte{byte(peer.Port >> 8), byte(peer.Port & 0xff)})
}
compactPeers.Write(peer.IPv4)
compactPeers.Write([]byte{byte(peer.Port >> 8), byte(peer.Port & 0xff)})
}
}
@ -89,17 +85,25 @@ func compactPeers(ipv6 bool, peers models.PeerList) []byte {
func peersList(ipv4s, ipv6s models.PeerList) (peers []bencode.Dict) {
for _, peer := range ipv4s {
peers = append(peers, peerDict(&peer))
peers = append(peers, peerDict(&peer, false))
}
for _, peer := range ipv6s {
peers = append(peers, peerDict(&peer))
peers = append(peers, peerDict(&peer, true))
}
return peers
}
func peerDict(peer *models.Peer) bencode.Dict {
func peerDict(peer *models.Peer, ipv6 bool) bencode.Dict {
var ip string
if ipv6 {
ip = peer.IPv6.String()
} else {
ip = peer.IPv4.String()
}
return bencode.Dict{
"ip": peer.IP.String(),
"ip": ip,
"peer id": peer.ID,
"port": peer.Port,
}

49
tracker/announce.go
View file

@ -125,7 +125,7 @@ func updateSwarm(c Conn, ann *models.Announce, p *models.Peer, t *models.Torrent
return
}
t.Seeders[p.ID] = *p
stats.RecordPeerEvent(stats.NewSeed, p.IPv6())
stats.RecordPeerEvent(stats.NewSeed, p.HasIPv6())
} else {
err = c.PutLeecher(t.Infohash, p)
@ -133,7 +133,7 @@ func updateSwarm(c Conn, ann *models.Announce, p *models.Peer, t *models.Torrent
return
}
t.Leechers[p.ID] = *p
stats.RecordPeerEvent(stats.NewLeech, p.IPv6())
stats.RecordPeerEvent(stats.NewLeech, p.HasIPv6())
}
created = true
}
@ -154,7 +154,7 @@ func handleEvent(c Conn, ann *models.Announce, p *models.Peer, u *models.User, t
return
}
delete(t.Seeders, p.ID)
stats.RecordPeerEvent(stats.DeletedSeed, p.IPv6())
stats.RecordPeerEvent(stats.DeletedSeed, p.HasIPv6())
} else if t.InLeecherPool(p) {
err = c.DeleteLeecher(t.Infohash, p.ID)
@ -162,7 +162,7 @@ func handleEvent(c Conn, ann *models.Announce, p *models.Peer, u *models.User, t
return
}
delete(t.Leechers, p.ID)
stats.RecordPeerEvent(stats.DeletedLeech, p.IPv6())
stats.RecordPeerEvent(stats.DeletedLeech, p.HasIPv6())
}
case ann.Event == "completed":
@ -205,7 +205,7 @@ func leecherFinished(c Conn, infohash string, p *models.Peer) error {
return err
}
stats.RecordPeerEvent(stats.Completed, p.IPv6())
stats.RecordPeerEvent(stats.Completed, p.HasIPv6())
return nil
}
@ -258,13 +258,13 @@ func appendPeers(ipv4s, ipv6s models.PeerList, ann *models.Announce, announcer *
continue
}
if peer.IP.To4() != nil {
ipv4s = append(ipv4s, peer)
} else if peer.IP.To16() != nil {
if announcer.HasIPv6() && peer.HasIPv6() {
ipv6s = append(ipv6s, peer)
count++
} else if peer.HasIPv4() {
ipv4s = append(ipv4s, peer)
count++
}
count++
}
return ipv4s, ipv6s
@ -273,14 +273,15 @@ func appendPeers(ipv4s, ipv6s models.PeerList, ann *models.Announce, announcer *
// appendSubnetPeers is an alternative version of appendPeers used when the
// config variable PreferredSubnet is enabled.
func appendSubnetPeers(ipv4s, ipv6s models.PeerList, ann *models.Announce, announcer *models.Peer, peers models.PeerMap, wanted int) (models.PeerList, models.PeerList) {
var subnet net.IPNet
var subnetIPv4 net.IPNet
var subnetIPv6 net.IPNet
if aip := announcer.IP.To4(); aip != nil {
subnet = net.IPNet{aip, net.CIDRMask(ann.Config.PreferredIPv4Subnet, 32)}
} else if aip := announcer.IP.To16(); aip != nil {
subnet = net.IPNet{aip, net.CIDRMask(ann.Config.PreferredIPv6Subnet, 128)}
} else {
panic("impossible: missing IP")
if announcer.HasIPv4() {
subnetIPv4 = net.IPNet{announcer.IPv4, net.CIDRMask(ann.Config.PreferredIPv4Subnet, 32)}
}
if announcer.HasIPv6() {
subnetIPv6 = net.IPNet{announcer.IPv6, net.CIDRMask(ann.Config.PreferredIPv6Subnet, 128)}
}
// Iterate over the peers twice: first add only peers in the same subnet and
@ -292,16 +293,20 @@ func appendSubnetPeers(ipv4s, ipv6s models.PeerList, ann *models.Announce, annou
break
}
if peersEquivalent(&peer, announcer) || checkInSubnet != subnet.Contains(peer.IP) {
inSubnet4 := peer.HasIPv4() && subnetIPv4.Contains(peer.IPv4)
inSubnet6 := peer.HasIPv6() && subnetIPv6.Contains(peer.IPv6)
if peersEquivalent(&peer, announcer) || checkInSubnet != (inSubnet4 || inSubnet6) {
continue
}
if peer.IP.To4() != nil {
ipv4s = append(ipv4s, peer)
} else if peer.IP.To16() != nil {
if announcer.HasIPv6() && peer.HasIPv6() {
ipv6s = append(ipv6s, peer)
count++
} else if peer.HasIPv4() {
ipv4s = append(ipv4s, peer)
count++
}
count++
}
}

4
tracker/memory/conn.go
View file

@ -270,14 +270,14 @@ func (c *Conn) PurgeInactivePeers(purgeEmptyTorrents bool, before time.Time) err
for key, peer := range torrent.Seeders {
if peer.LastAnnounce <= unixtime {
delete(torrent.Seeders, key)
stats.RecordPeerEvent(stats.ReapedSeed, peer.IPv6())
stats.RecordPeerEvent(stats.ReapedSeed, peer.HasIPv6())
}
}
for key, peer := range torrent.Leechers {
if peer.LastAnnounce <= unixtime {
delete(torrent.Leechers, key)
stats.RecordPeerEvent(stats.ReapedLeech, peer.IPv6())
stats.RecordPeerEvent(stats.ReapedLeech, peer.HasIPv6())
}
}

17
tracker/models/models.go
View file

@ -41,7 +41,8 @@ type Peer struct {
UserID uint64 `json:"user_id"`
TorrentID uint64 `json:"torrent_id"`
IP net.IP `json:"ip"`
IPv4 net.IP `json:"ipv4,omitempty"`
IPv6 net.IP `json:"ipv6,omitempty"`
Port uint64 `json:"port"`
Uploaded uint64 `json:"uploaded"`
@ -78,7 +79,8 @@ func NewPeer(a *Announce, u *User, t *Torrent) *Peer {
ID: a.PeerID,
UserID: userID,
TorrentID: torrentID,
IP: a.IP,
IPv4: a.IPv4,
IPv6: a.IPv6,
Port: a.Port,
Uploaded: a.Uploaded,
Downloaded: a.Downloaded,
@ -87,12 +89,12 @@ func NewPeer(a *Announce, u *User, t *Torrent) *Peer {
}
}
func (p *Peer) IPv4() bool {
return p.IP.To4() != nil
func (p *Peer) HasIPv4() bool {
return p.IPv4 != nil
}
func (p *Peer) IPv6() bool {
return !p.IPv4()
func (p *Peer) HasIPv6() bool {
return p.IPv6 != nil
}
// Torrent is a swarm for a given torrent file.
@ -143,7 +145,8 @@ type Announce struct {
Compact bool `json:"compact"`
Downloaded uint64 `json:"downloaded"`
Event string `json:"event"`
IP net.IP `json:"ip"`
IPv4 net.IP `json:"ipv4"`
IPv6 net.IP `json:"ipv6"`
Infohash string `json:"infohash"`
Left uint64 `json:"left"`
NumWant int `json:"numwant"`