9 "github.com/anacrolix/missinggo"
10 "github.com/anacrolix/missinggo/perf"
11 "github.com/pkg/errors"
12 "golang.org/x/net/proxy"
15 type dialer interface {
16 dial(_ context.Context, addr string) (net.Conn, error)
19 type socket interface {
24 func getProxyDialer(proxyURL string) (proxy.Dialer, error) {
25 fixedURL, err := url.Parse(proxyURL)
30 return proxy.FromURL(fixedURL, proxy.Direct)
33 func listen(n network, addr, proxyURL string, f firewallCallback) (socket, error) {
36 return listenTcp(n.String(), addr, proxyURL)
38 return listenUtp(n.String(), addr, proxyURL, f)
44 func listenTcp(network, address, proxyURL string) (s socket, err error) {
45 l, err := net.Listen(network, address)
55 // If we don't need the proxy - then we should return default net.Dialer,
56 // otherwise, let's try to parse the proxyURL and return proxy.Dialer
57 if len(proxyURL) != 0 {
58 // TODO: The error should be propagated, as proxy may be in use for
59 // security or privacy reasons. Also just pass proxy.Dialer in from
61 if dialer, err := getProxyDialer(proxyURL); err == nil {
62 return tcpSocket{l, func(ctx context.Context, addr string) (conn net.Conn, err error) {
63 defer perf.ScopeTimerErr(&err)()
64 return dialer.Dial(network, addr)
68 dialer := net.Dialer{}
69 return tcpSocket{l, func(ctx context.Context, addr string) (conn net.Conn, err error) {
70 defer perf.ScopeTimerErr(&err)()
71 return dialer.DialContext(ctx, network, addr)
75 type tcpSocket struct {
77 d func(ctx context.Context, addr string) (net.Conn, error)
80 func (me tcpSocket) dial(ctx context.Context, addr string) (net.Conn, error) {
81 return me.d(ctx, addr)
84 func listenAll(networks []network, getHost func(string) string, port int, proxyURL string, f firewallCallback) ([]socket, error) {
85 if len(networks) == 0 {
88 var nahs []networkAndHost
89 for _, n := range networks {
90 nahs = append(nahs, networkAndHost{n, getHost(n.String())})
93 ss, retry, err := listenAllRetry(nahs, port, proxyURL, f)
100 type networkAndHost struct {
105 func listenAllRetry(nahs []networkAndHost, port int, proxyURL string, f firewallCallback) (ss []socket, retry bool, err error) {
106 ss = make([]socket, 1, len(nahs))
107 portStr := strconv.FormatInt(int64(port), 10)
108 ss[0], err = listen(nahs[0].Network, net.JoinHostPort(nahs[0].Host, portStr), proxyURL, f)
110 return nil, false, errors.Wrap(err, "first listen")
113 if err != nil || retry {
114 for _, s := range ss {
120 portStr = strconv.FormatInt(int64(missinggo.AddrPort(ss[0].Addr())), 10)
121 for _, nah := range nahs[1:] {
122 s, err := listen(nah.Network, net.JoinHostPort(nah.Host, portStr), proxyURL, f)
125 missinggo.IsAddrInUse(err) && port == 0,
126 errors.Wrap(err, "subsequent listen")
133 type firewallCallback func(net.Addr) bool
135 func listenUtp(network, addr, proxyURL string, fc firewallCallback) (s socket, err error) {
136 us, err := NewUtpSocket(network, addr, fc)
141 // If we don't need the proxy - then we should return default net.Dialer,
142 // otherwise, let's try to parse the proxyURL and return proxy.Dialer
143 if len(proxyURL) != 0 {
144 if dialer, err := getProxyDialer(proxyURL); err == nil {
145 return utpSocketSocket{us, network, dialer}, nil
149 return utpSocketSocket{us, network, nil}, nil
152 type utpSocketSocket struct {
158 func (me utpSocketSocket) dial(ctx context.Context, addr string) (conn net.Conn, err error) {
159 defer perf.ScopeTimerErr(&err)()
161 return me.d.Dial(me.network, addr)
164 return me.utpSocket.DialContext(ctx, me.network, addr)