8 "github.com/anacrolix/missinggo"
9 "github.com/anacrolix/missinggo/perf"
10 "github.com/pkg/errors"
13 type Listener interface {
14 // Accept waits for and returns the next connection to the listener.
15 Accept() (net.Conn, error)
17 // Addr returns the listener's network address.
21 type socket interface {
27 func listen(n network, addr string, f firewallCallback) (socket, error) {
30 return listenTcp(n.String(), addr)
32 return listenUtp(n.String(), addr, f)
38 func listenTcp(network, address string) (s socket, err error) {
39 l, err := net.Listen(network, address)
48 type tcpSocket struct {
53 func listenAll(networks []network, getHost func(string) string, port int, f firewallCallback) ([]socket, error) {
54 if len(networks) == 0 {
57 var nahs []networkAndHost
58 for _, n := range networks {
59 nahs = append(nahs, networkAndHost{n, getHost(n.String())})
62 ss, retry, err := listenAllRetry(nahs, port, f)
69 type networkAndHost struct {
74 func listenAllRetry(nahs []networkAndHost, port int, f firewallCallback) (ss []socket, retry bool, err error) {
75 ss = make([]socket, 1, len(nahs))
76 portStr := strconv.FormatInt(int64(port), 10)
77 ss[0], err = listen(nahs[0].Network, net.JoinHostPort(nahs[0].Host, portStr), f)
79 return nil, false, errors.Wrap(err, "first listen")
82 if err != nil || retry {
83 for _, s := range ss {
89 portStr = strconv.FormatInt(int64(missinggo.AddrPort(ss[0].Addr())), 10)
90 for _, nah := range nahs[1:] {
91 s, err := listen(nah.Network, net.JoinHostPort(nah.Host, portStr), f)
94 missinggo.IsAddrInUse(err) && port == 0,
95 errors.Wrap(err, "subsequent listen")
102 type firewallCallback func(net.Addr) bool
104 func listenUtp(network, addr string, fc firewallCallback) (socket, error) {
105 us, err := NewUtpSocket(network, addr, fc)
106 return utpSocketSocket{us, network}, err
109 // utpSocket wrapper, additionally wrapped for the torrent package's socket interface.
110 type utpSocketSocket struct {
115 func (me utpSocketSocket) DialerNetwork() string {
119 func (me utpSocketSocket) Dial(ctx context.Context, addr string) (conn net.Conn, err error) {
120 defer perf.ScopeTimerErr(&err)()
121 return me.utpSocket.DialContext(ctx, me.network, addr)