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