tracker/udp_test.go

   1 package tracker
   2
   3 import (
   4         "bytes"
   5         "crypto/rand"
   6         "encoding/binary"
   7         "fmt"
   8         "io"
   9         "io/ioutil"
  10         "net"
  11         "net/url"
  12         "sync"
  13         "testing"
  14
  15         _ "github.com/anacrolix/envpprof"
  16         "github.com/stretchr/testify/assert"
  17         "github.com/stretchr/testify/require"
  18
  19         "github.com/anacrolix/torrent/util"
  20 )
  21
  22 // Ensure net.IPs are stored big-endian, to match the way they're read from
  23 // the wire.
  24 func TestNetIPv4Bytes(t *testing.T) {
  25         ip := net.IP([]byte{127, 0, 0, 1})
  26         if ip.String() != "127.0.0.1" {
  27                 t.FailNow()
  28         }
  29         if string(ip) != "\x7f\x00\x00\x01" {
  30                 t.Fatal([]byte(ip))
  31         }
  32 }
  33
  34 func TestMarshalAnnounceResponse(t *testing.T) {
  35         peers := util.CompactIPv4Peers{
  36                 {[]byte{127, 0, 0, 1}, 2},
  37                 {[]byte{255, 0, 0, 3}, 4},
  38         }
  39         b, err := peers.MarshalBinary()
  40         require.NoError(t, err)
  41         require.EqualValues(t,
  42                 "\x7f\x00\x00\x01\x00\x02\xff\x00\x00\x03\x00\x04",
  43                 b)
  44         require.EqualValues(t, 12, binary.Size(AnnounceResponseHeader{}))
  45 }
  46
  47 // Failure to write an entire packet to UDP is expected to given an error.
  48 func TestLongWriteUDP(t *testing.T) {
  49         t.Parallel()
  50         l, err := net.ListenUDP("udp4", nil)
  51         defer l.Close()
  52         if err != nil {
  53                 t.Fatal(err)
  54         }
  55         c, err := net.DialUDP("udp", nil, l.LocalAddr().(*net.UDPAddr))
  56         if err != nil {
  57                 t.Fatal(err)
  58         }
  59         defer c.Close()
  60         for msgLen := 1; ; msgLen *= 2 {
  61                 n, err := c.Write(make([]byte, msgLen))
  62                 if err != nil {
  63                         require.Contains(t, err.Error(), "message too long")
  64                         return
  65                 }
  66                 if n < msgLen {
  67                         t.FailNow()
  68                 }
  69         }
  70 }
  71
  72 func TestShortBinaryRead(t *testing.T) {
  73         var data ResponseHeader
  74         err := binary.Read(bytes.NewBufferString("\x00\x00\x00\x01"), binary.BigEndian, &data)
  75         if err != io.ErrUnexpectedEOF {
  76                 t.FailNow()
  77         }
  78 }
  79
  80 func TestConvertInt16ToInt(t *testing.T) {
  81         i := 50000
  82         if int(uint16(int16(i))) != 50000 {
  83                 t.FailNow()
  84         }
  85 }
  86
  87 func TestAnnounceLocalhost(t *testing.T) {
  88         t.Parallel()
  89         srv := server{
  90                 t: map[[20]byte]torrent{
  91                         {0xa3, 0x56, 0x41, 0x43, 0x74, 0x23, 0xe6, 0x26, 0xd9, 0x38, 0x25, 0x4a, 0x6b, 0x80, 0x49, 0x10, 0xa6, 0x67, 0xa, 0xc1}: {
  92                                 Seeders:  1,
  93                                 Leechers: 2,
  94                                 Peers: []util.CompactPeer{
  95                                         {[]byte{1, 2, 3, 4}, 5},
  96                                         {[]byte{6, 7, 8, 9}, 10},
  97                                 },
  98                         },
  99                 },
 100         }
 101         var err error
 102         srv.pc, err = net.ListenPacket("udp", ":0")
 103         require.NoError(t, err)
 104         defer srv.pc.Close()
 105         go func() {
 106                 require.NoError(t, srv.serveOne())
 107         }()
 108         req := AnnounceRequest{
 109                 NumWant: -1,
 110                 Event:   Started,
 111         }
 112         rand.Read(req.PeerId[:])
 113         copy(req.InfoHash[:], []uint8{0xa3, 0x56, 0x41, 0x43, 0x74, 0x23, 0xe6, 0x26, 0xd9, 0x38, 0x25, 0x4a, 0x6b, 0x80, 0x49, 0x10, 0xa6, 0x67, 0xa, 0xc1})
 114         go func() {
 115                 require.NoError(t, srv.serveOne())
 116         }()
 117         ar, err := Announce(defaultClient, fmt.Sprintf("udp://%s/announce", srv.pc.LocalAddr().String()), &req)
 118         require.NoError(t, err)
 119         assert.EqualValues(t, 1, ar.Seeders)
 120         assert.EqualValues(t, 2, len(ar.Peers))
 121 }
 122
 123 func TestUDPTracker(t *testing.T) {
 124         t.Parallel()
 125         if testing.Short() {
 126                 t.SkipNow()
 127         }
 128         req := AnnounceRequest{
 129                 NumWant: -1,
 130         }
 131         rand.Read(req.PeerId[:])
 132         copy(req.InfoHash[:], []uint8{0xa3, 0x56, 0x41, 0x43, 0x74, 0x23, 0xe6, 0x26, 0xd9, 0x38, 0x25, 0x4a, 0x6b, 0x80, 0x49, 0x10, 0xa6, 0x67, 0xa, 0xc1})
 133         ar, err := Announce(defaultClient, "udp://tracker.openbittorrent.com:80/announce", &req)
 134         // Skip any net errors as we don't control the server.
 135         if _, ok := err.(net.Error); ok {
 136                 t.Skip(err)
 137         }
 138         require.NoError(t, err)
 139         t.Log(ar)
 140 }
 141
 142 func TestAnnounceRandomInfoHashThirdParty(t *testing.T) {
 143         t.Parallel()
 144         if testing.Short() {
 145                 // This test involves contacting third party servers that may have
 146                 // unpreditable results.
 147                 t.SkipNow()
 148         }
 149         req := AnnounceRequest{
 150                 Event: Stopped,
 151         }
 152         rand.Read(req.PeerId[:])
 153         rand.Read(req.InfoHash[:])
 154         wg := sync.WaitGroup{}
 155         success := make(chan bool)
 156         fail := make(chan struct{})
 157         for _, url := range []string{
 158                 "udp://tracker.openbittorrent.com:80/announce",
 159                 "udp://tracker.publicbt.com:80",
 160                 "udp://tracker.istole.it:6969",
 161                 "udp://tracker.ccc.de:80",
 162                 "udp://tracker.open.demonii.com:1337",
 163                 "udp://open.demonii.com:1337",
 164                 "udp://exodus.desync.com:6969",
 165         } {
 166                 wg.Add(1)
 167                 go func(url string) {
 168                         defer wg.Done()
 169                         resp, err := Announce(defaultClient, url, &req)
 170                         if err != nil {
 171                                 t.Logf("error announcing to %s: %s", url, err)
 172                                 return
 173                         }
 174                         if resp.Leechers != 0 || resp.Seeders != 0 || len(resp.Peers) != 0 {
 175                                 // The info hash we generated was random in 2^160 space. If we
 176                                 // get a hit, something is weird.
 177                                 t.Fatal(resp)
 178                         }
 179                         t.Logf("announced to %s", url)
 180                         // TODO: Can probably get stuck here, but it's just a throwaway
 181                         // test.
 182                         success <- true
 183                 }(url)
 184         }
 185         go func() {
 186                 wg.Wait()
 187                 close(fail)
 188         }()
 189         select {
 190         case <-fail:
 191                 // It doesn't matter if they all fail, the servers could just be down.
 192         case <-success:
 193                 // Bail as quickly as we can. One success is enough.
 194         }
 195 }
 196
 197 // Check that URLPath option is done correctly.
 198 func TestURLPathOption(t *testing.T) {
 199         conn, err := net.ListenUDP("udp", nil)
 200         if err != nil {
 201                 panic(err)
 202         }
 203         defer conn.Close()
 204         go func() {
 205                 _, err := Announce(defaultClient, (&url.URL{
 206                         Scheme: "udp",
 207                         Host:   conn.LocalAddr().String(),
 208                         Path:   "/announce",
 209                 }).String(), &AnnounceRequest{})
 210                 if err != nil {
 211                         defer conn.Close()
 212                 }
 213                 require.NoError(t, err)
 214         }()
 215         var b [512]byte
 216         _, addr, _ := conn.ReadFrom(b[:])
 217         r := bytes.NewReader(b[:])
 218         var h RequestHeader
 219         read(r, &h)
 220         w := &bytes.Buffer{}
 221         write(w, ResponseHeader{
 222                 TransactionId: h.TransactionId,
 223         })
 224         write(w, ConnectionResponse{42})
 225         conn.WriteTo(w.Bytes(), addr)
 226         n, _, _ := conn.ReadFrom(b[:])
 227         r = bytes.NewReader(b[:n])
 228         read(r, &h)
 229         read(r, &AnnounceRequest{})
 230         all, _ := ioutil.ReadAll(r)
 231         if string(all) != "\x02\x09/announce" {
 232                 t.FailNow()
 233         }
 234         w = &bytes.Buffer{}
 235         write(w, ResponseHeader{
 236                 TransactionId: h.TransactionId,
 237         })
 238         write(w, AnnounceResponseHeader{})
 239         conn.WriteTo(w.Bytes(), addr)
 240 }