/
http.go
177 lines (166 loc) · 4.79 KB
/
http.go
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package tracker
import (
"bytes"
"crypto/tls"
"fmt"
"io"
"math"
"net"
"net/http"
"net/url"
"strconv"
"github.com/anacrolix/dht/v2/krpc"
"github.com/anacrolix/missinggo/httptoo"
"github.com/anacrolix/torrent/bencode"
)
type HttpResponse struct {
FailureReason string `bencode:"failure reason"`
Interval int32 `bencode:"interval"`
TrackerId string `bencode:"tracker id"`
Complete int32 `bencode:"complete"`
Incomplete int32 `bencode:"incomplete"`
Peers Peers `bencode:"peers"`
// BEP 7
Peers6 krpc.CompactIPv6NodeAddrs `bencode:"peers6"`
}
type Peers []Peer
func (me *Peers) UnmarshalBencode(b []byte) (err error) {
var _v interface{}
err = bencode.Unmarshal(b, &_v)
if err != nil {
return
}
switch v := _v.(type) {
case string:
vars.Add("http responses with string peers", 1)
var cnas krpc.CompactIPv4NodeAddrs
err = cnas.UnmarshalBinary([]byte(v))
if err != nil {
return
}
for _, cp := range cnas {
*me = append(*me, Peer{
IP: cp.IP[:],
Port: int(cp.Port),
})
}
return
case []interface{}:
vars.Add("http responses with list peers", 1)
for _, i := range v {
var p Peer
p.FromDictInterface(i.(map[string]interface{}))
*me = append(*me, p)
}
return
default:
vars.Add("http responses with unhandled peers type", 1)
err = fmt.Errorf("unsupported type: %T", _v)
return
}
}
func setAnnounceParams(_url *url.URL, ar *AnnounceRequest, opts Announce) {
q := _url.Query()
q.Set("key", strconv.FormatInt(int64(ar.Key), 10))
q.Set("info_hash", string(ar.InfoHash[:]))
q.Set("peer_id", string(ar.PeerId[:]))
// AFAICT, port is mandatory, and there's no implied port key.
q.Set("port", fmt.Sprintf("%d", ar.Port))
q.Set("uploaded", strconv.FormatInt(ar.Uploaded, 10))
q.Set("downloaded", strconv.FormatInt(ar.Downloaded, 10))
// The AWS S3 tracker returns "400 Bad Request: left(-1) was not in the valid range 0 -
// 9223372036854775807" if left is out of range, or "500 Internal Server Error: Internal Server
// Error" if omitted entirely.
left := ar.Left
if left < 0 {
left = math.MaxInt64
}
q.Set("left", strconv.FormatInt(left, 10))
if ar.Event != None {
q.Set("event", ar.Event.String())
}
// http://stackoverflow.com/questions/17418004/why-does-tracker-server-not-understand-my-request-bittorrent-protocol
q.Set("compact", "1")
// According to https://wiki.vuze.com/w/Message_Stream_Encryption. TODO:
// Take EncryptionPolicy or something like it as a parameter.
q.Set("supportcrypto", "1")
doIp := func(versionKey string, ip net.IP) {
if ip == nil {
return
}
ipString := ip.String()
q.Set(versionKey, ipString)
// Let's try listing them. BEP 3 mentions having an "ip" param, and BEP 7 says we can list
// addresses for other address-families, although it's not encouraged.
q.Add("ip", ipString)
}
doIp("ipv4", opts.ClientIp4.IP)
doIp("ipv6", opts.ClientIp6.IP)
_url.RawQuery = q.Encode()
}
func announceHTTP(opt Announce, _url *url.URL) (ret AnnounceResponse, err error) {
_url = httptoo.CopyURL(_url)
setAnnounceParams(_url, &opt.Request, opt)
req, err := http.NewRequest("GET", _url.String(), nil)
req.Header.Set("User-Agent", opt.UserAgent)
req.Host = opt.HostHeader
if opt.Context != nil {
req = req.WithContext(opt.Context)
}
resp, err := (&http.Client{
//Timeout: time.Second * 15,
Transport: &http.Transport{
//Dial: (&net.Dialer{
// Timeout: 15 * time.Second,
//}).Dial,
Proxy: opt.HTTPProxy,
//TLSHandshakeTimeout: 15 * time.Second,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
ServerName: opt.ServerName,
},
// This is for S3 trackers that hold connections open.
DisableKeepAlives: true,
},
}).Do(req)
if err != nil {
return
}
defer resp.Body.Close()
var buf bytes.Buffer
io.Copy(&buf, resp.Body)
if resp.StatusCode != 200 {
err = fmt.Errorf("response from tracker: %s: %s", resp.Status, buf.String())
return
}
var trackerResponse HttpResponse
err = bencode.Unmarshal(buf.Bytes(), &trackerResponse)
if _, ok := err.(bencode.ErrUnusedTrailingBytes); ok {
err = nil
} else if err != nil {
err = fmt.Errorf("error decoding %q: %s", buf.Bytes(), err)
return
}
if trackerResponse.FailureReason != "" {
err = fmt.Errorf("tracker gave failure reason: %q", trackerResponse.FailureReason)
return
}
vars.Add("successful http announces", 1)
ret.Interval = trackerResponse.Interval
ret.Leechers = trackerResponse.Incomplete
ret.Seeders = trackerResponse.Complete
if len(trackerResponse.Peers) != 0 {
vars.Add("http responses with nonempty peers key", 1)
}
ret.Peers = trackerResponse.Peers
if len(trackerResponse.Peers6) != 0 {
vars.Add("http responses with nonempty peers6 key", 1)
}
for _, na := range trackerResponse.Peers6 {
ret.Peers = append(ret.Peers, Peer{
IP: na.IP,
Port: na.Port,
})
}
return
}