98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
package tracker
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import (
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"encoding"
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"encoding/binary"
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"net"
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"net/url"
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"github.com/anacrolix/dht/v2/krpc"
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"github.com/anacrolix/missinggo"
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trHttp "github.com/anacrolix/torrent/tracker/http"
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"github.com/anacrolix/torrent/tracker/udp"
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)
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type udpAnnounce struct {
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url url.URL
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a *Announce
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}
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func (c *udpAnnounce) Close() error {
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return nil
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}
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func (c *udpAnnounce) ipv6(conn net.Conn) bool {
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if c.a.UdpNetwork == "udp6" {
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return true
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}
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rip := missinggo.AddrIP(conn.RemoteAddr())
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return rip.To16() != nil && rip.To4() == nil
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}
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func (c *udpAnnounce) Do(req AnnounceRequest) (res AnnounceResponse, err error) {
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conn, err := net.Dial(c.dialNetwork(), c.url.Host)
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if err != nil {
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return
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}
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defer conn.Close()
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if c.ipv6(conn) {
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// BEP 15
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req.IPAddress = 0
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} else if req.IPAddress == 0 && c.a.ClientIp4.IP != nil {
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req.IPAddress = binary.BigEndian.Uint32(c.a.ClientIp4.IP.To4())
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}
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d := udp.Dispatcher{}
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go func() {
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for {
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b := make([]byte, 0x800)
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n, err := conn.Read(b)
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if err != nil {
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break
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}
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d.Dispatch(b[:n])
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}
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}()
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cl := udp.Client{
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Dispatcher: &d,
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Writer: conn,
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}
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nas := func() interface {
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encoding.BinaryUnmarshaler
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NodeAddrs() []krpc.NodeAddr
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} {
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if c.ipv6(conn) {
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return &krpc.CompactIPv6NodeAddrs{}
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} else {
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return &krpc.CompactIPv4NodeAddrs{}
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}
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}()
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h, err := cl.Announce(c.a.Context, req, nas, udp.Options{RequestUri: c.url.RequestURI()})
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if err != nil {
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return
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}
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res.Interval = h.Interval
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res.Leechers = h.Leechers
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res.Seeders = h.Seeders
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for _, cp := range nas.NodeAddrs() {
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res.Peers = append(res.Peers, trHttp.Peer{}.FromNodeAddr(cp))
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}
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return
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}
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func (c *udpAnnounce) dialNetwork() string {
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if c.a.UdpNetwork != "" {
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return c.a.UdpNetwork
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}
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return "udp"
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}
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// TODO: Split on IPv6, as BEP 15 says response peer decoding depends on network in use.
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func announceUDP(opt Announce, _url *url.URL) (AnnounceResponse, error) {
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ua := udpAnnounce{
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url: *_url,
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a: &opt,
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}
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defer ua.Close()
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return ua.Do(opt.Request)
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}
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