14 "github.com/anacrolix/dht/v2/krpc"
15 "github.com/anacrolix/missinggo/httptoo"
17 "github.com/anacrolix/torrent/bencode"
20 type HttpResponse struct {
21 FailureReason string `bencode:"failure reason"`
22 Interval int32 `bencode:"interval"`
23 TrackerId string `bencode:"tracker id"`
24 Complete int32 `bencode:"complete"`
25 Incomplete int32 `bencode:"incomplete"`
26 Peers Peers `bencode:"peers"`
28 Peers6 krpc.CompactIPv6NodeAddrs `bencode:"peers6"`
33 func (me *Peers) UnmarshalBencode(b []byte) (err error) {
35 err = bencode.Unmarshal(b, &_v)
39 switch v := _v.(type) {
41 vars.Add("http responses with string peers", 1)
42 var cnas krpc.CompactIPv4NodeAddrs
43 err = cnas.UnmarshalBinary([]byte(v))
47 for _, cp := range cnas {
48 *me = append(*me, Peer{
55 vars.Add("http responses with list peers", 1)
58 p.FromDictInterface(i.(map[string]interface{}))
63 vars.Add("http responses with unhandled peers type", 1)
64 err = fmt.Errorf("unsupported type: %T", _v)
69 func setAnnounceParams(_url *url.URL, ar *AnnounceRequest, opts Announce) {
72 q.Set("key", strconv.FormatInt(int64(ar.Key), 10))
73 q.Set("info_hash", string(ar.InfoHash[:]))
74 q.Set("peer_id", string(ar.PeerId[:]))
75 // AFAICT, port is mandatory, and there's no implied port key.
76 q.Set("port", fmt.Sprintf("%d", ar.Port))
77 q.Set("uploaded", strconv.FormatInt(ar.Uploaded, 10))
78 q.Set("downloaded", strconv.FormatInt(ar.Downloaded, 10))
80 // The AWS S3 tracker returns "400 Bad Request: left(-1) was not in the valid range 0 -
81 // 9223372036854775807" if left is out of range, or "500 Internal Server Error: Internal Server
82 // Error" if omitted entirely.
87 q.Set("left", strconv.FormatInt(left, 10))
90 q.Set("event", ar.Event.String())
92 // http://stackoverflow.com/questions/17418004/why-does-tracker-server-not-understand-my-request-bittorrent-protocol
94 // According to https://wiki.vuze.com/w/Message_Stream_Encryption. TODO:
95 // Take EncryptionPolicy or something like it as a parameter.
96 q.Set("supportcrypto", "1")
97 doIp := func(versionKey string, ip net.IP) {
101 ipString := ip.String()
102 q.Set(versionKey, ipString)
103 // Let's try listing them. BEP 3 mentions having an "ip" param, and BEP 7 says we can list
104 // addresses for other address-families, although it's not encouraged.
105 q.Add("ip", ipString)
107 doIp("ipv4", opts.ClientIp4.IP)
108 doIp("ipv6", opts.ClientIp6.IP)
109 _url.RawQuery = q.Encode()
112 func announceHTTP(opt Announce, _url *url.URL) (ret AnnounceResponse, err error) {
113 _url = httptoo.CopyURL(_url)
114 setAnnounceParams(_url, &opt.Request, opt)
115 req, err := http.NewRequest("GET", _url.String(), nil)
116 req.Header.Set("User-Agent", opt.UserAgent)
117 req.Host = opt.HostHeader
118 if opt.Context != nil {
119 req = req.WithContext(opt.Context)
121 resp, err := (&http.Client{
122 //Timeout: time.Second * 15,
123 Transport: &http.Transport{
124 //Dial: (&net.Dialer{
125 // Timeout: 15 * time.Second,
127 Proxy: opt.HTTPProxy,
128 //TLSHandshakeTimeout: 15 * time.Second,
129 TLSClientConfig: &tls.Config{
130 InsecureSkipVerify: true,
131 ServerName: opt.ServerName,
133 // This is for S3 trackers that hold connections open.
134 DisableKeepAlives: true,
140 defer resp.Body.Close()
142 io.Copy(&buf, resp.Body)
143 if resp.StatusCode != 200 {
144 err = fmt.Errorf("response from tracker: %s: %s", resp.Status, buf.String())
147 var trackerResponse HttpResponse
148 err = bencode.Unmarshal(buf.Bytes(), &trackerResponse)
149 if _, ok := err.(bencode.ErrUnusedTrailingBytes); ok {
151 } else if err != nil {
152 err = fmt.Errorf("error decoding %q: %s", buf.Bytes(), err)
155 if trackerResponse.FailureReason != "" {
156 err = fmt.Errorf("tracker gave failure reason: %q", trackerResponse.FailureReason)
159 vars.Add("successful http announces", 1)
160 ret.Interval = trackerResponse.Interval
161 ret.Leechers = trackerResponse.Incomplete
162 ret.Seeders = trackerResponse.Complete
163 if len(trackerResponse.Peers) != 0 {
164 vars.Add("http responses with nonempty peers key", 1)
166 ret.Peers = trackerResponse.Peers
167 if len(trackerResponse.Peers6) != 0 {
168 vars.Add("http responses with nonempty peers6 key", 1)
170 for _, na := range trackerResponse.Peers6 {
171 ret.Peers = append(ret.Peers, Peer{