1 package httpTrackerServer
11 "github.com/anacrolix/dht/v2/krpc"
12 "github.com/anacrolix/log"
14 "github.com/anacrolix/torrent/bencode"
15 "github.com/anacrolix/torrent/tracker"
16 httpTracker "github.com/anacrolix/torrent/tracker/http"
20 Announce tracker.AnnounceHandler
21 // Called to derive an announcer's IP if non-nil. If not specified, the Request.RemoteAddr is
22 // used. Necessary for instances running behind reverse proxies for example.
23 RequestHost func(r *http.Request) (netip.Addr, error)
26 func unmarshalQueryKeyToArray(w http.ResponseWriter, key string, query url.Values) (ret [20]byte, ok bool) {
28 if len(str) != len(ret) {
29 http.Error(w, fmt.Sprintf("%v has wrong length", key), http.StatusBadRequest)
37 var Logger = log.NewLogger("anacrolix", "torrent", "tracker", "http", "server")
39 // Returns false if there was an error and it was served.
40 func (me Handler) requestHostAddr(r *http.Request) (_ netip.Addr, err error) {
41 if me.RequestHost != nil {
42 return me.RequestHost(r)
44 host, _, err := net.SplitHostPort(r.RemoteAddr)
48 return netip.ParseAddr(host)
51 func (me Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
53 var event tracker.AnnounceEvent
54 err := event.UnmarshalText([]byte(vs.Get("event")))
56 http.Error(w, err.Error(), http.StatusBadRequest)
59 infoHash, ok := unmarshalQueryKeyToArray(w, "info_hash", vs)
63 peerId, ok := unmarshalQueryKeyToArray(w, "peer_id", vs)
67 Logger.WithNames("request").Levelf(log.Debug, "request RemoteAddr=%q, header=%q", r.RemoteAddr, r.Header)
68 addr, err := me.requestHostAddr(r)
70 log.Printf("error getting requester IP: %v", err)
71 http.Error(w, "error determining your IP", http.StatusBadGateway)
74 portU64, err := strconv.ParseUint(vs.Get("port"), 0, 16)
75 addrPort := netip.AddrPortFrom(addr, uint16(portU64))
76 peers, err := me.Announce.Serve(r.Context(), tracker.AnnounceRequest{
80 Port: addrPort.Port(),
83 log.Printf("error serving announce: %v", err)
84 http.Error(w, "error handling announce", http.StatusInternalServerError)
87 var resp httpTracker.HttpResponse
88 resp.Interval = 5 * 60
89 resp.Peers.Compact = true
90 for _, peer := range peers {
91 if peer.Addr().Is4() {
92 resp.Peers.List = append(resp.Peers.List, tracker.Peer{
93 IP: peer.Addr().AsSlice(),
94 Port: int(peer.Port()),
96 } else if peer.Addr().Is6() {
97 resp.Peers6 = append(resp.Peers6, krpc.NodeAddr{
98 IP: peer.Addr().AsSlice(),
99 Port: int(peer.Port()),
103 err = bencode.NewEncoder(w).Encode(resp)
105 log.Printf("error encoding and writing response body: %v", err)