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socket.go
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socket.go
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package torrent
import (
"context"
"net"
"net/url"
"strconv"
"github.com/anacrolix/missinggo"
"github.com/anacrolix/missinggo/perf"
"github.com/pkg/errors"
"golang.org/x/net/proxy"
)
type dialer interface {
dial(_ context.Context, addr string) (net.Conn, error)
}
type socket interface {
net.Listener
dialer
}
func getProxyDialer(proxyURL string) (proxy.Dialer, error) {
fixedURL, err := url.Parse(proxyURL)
if err != nil {
return nil, err
}
return proxy.FromURL(fixedURL, proxy.Direct)
}
func listen(n network, addr, proxyURL string, f firewallCallback) (socket, error) {
switch {
case n.Tcp:
return listenTcp(n.String(), addr, proxyURL)
case n.Udp:
return listenUtp(n.String(), addr, proxyURL, f)
default:
panic(n)
}
}
func listenTcp(network, address, proxyURL string) (s socket, err error) {
l, err := net.Listen(network, address)
if err != nil {
return
}
defer func() {
if err != nil {
l.Close()
}
}()
// If we don't need the proxy - then we should return default net.Dialer,
// otherwise, let's try to parse the proxyURL and return proxy.Dialer
if len(proxyURL) != 0 {
// TODO: The error should be propagated, as proxy may be in use for
// security or privacy reasons. Also just pass proxy.Dialer in from
// the Config.
if dialer, err := getProxyDialer(proxyURL); err == nil {
return tcpSocket{l, func(ctx context.Context, addr string) (conn net.Conn, err error) {
defer perf.ScopeTimerErr(&err)()
return dialer.Dial(network, addr)
}}, nil
}
}
dialer := net.Dialer{}
return tcpSocket{l, func(ctx context.Context, addr string) (conn net.Conn, err error) {
defer perf.ScopeTimerErr(&err)()
return dialer.DialContext(ctx, network, addr)
}}, nil
}
type tcpSocket struct {
net.Listener
d func(ctx context.Context, addr string) (net.Conn, error)
}
func (me tcpSocket) dial(ctx context.Context, addr string) (net.Conn, error) {
return me.d(ctx, addr)
}
func listenAll(networks []network, getHost func(string) string, port int, proxyURL string, f firewallCallback) ([]socket, error) {
if len(networks) == 0 {
return nil, nil
}
var nahs []networkAndHost
for _, n := range networks {
nahs = append(nahs, networkAndHost{n, getHost(n.String())})
}
for {
ss, retry, err := listenAllRetry(nahs, port, proxyURL, f)
if !retry {
return ss, err
}
}
}
type networkAndHost struct {
Network network
Host string
}
func listenAllRetry(nahs []networkAndHost, port int, proxyURL string, f firewallCallback) (ss []socket, retry bool, err error) {
ss = make([]socket, 1, len(nahs))
portStr := strconv.FormatInt(int64(port), 10)
ss[0], err = listen(nahs[0].Network, net.JoinHostPort(nahs[0].Host, portStr), proxyURL, f)
if err != nil {
return nil, false, errors.Wrap(err, "first listen")
}
defer func() {
if err != nil || retry {
for _, s := range ss {
s.Close()
}
ss = nil
}
}()
portStr = strconv.FormatInt(int64(missinggo.AddrPort(ss[0].Addr())), 10)
for _, nah := range nahs[1:] {
s, err := listen(nah.Network, net.JoinHostPort(nah.Host, portStr), proxyURL, f)
if err != nil {
return ss,
missinggo.IsAddrInUse(err) && port == 0,
errors.Wrap(err, "subsequent listen")
}
ss = append(ss, s)
}
return
}
type firewallCallback func(net.Addr) bool
func listenUtp(network, addr, proxyURL string, fc firewallCallback) (s socket, err error) {
us, err := NewUtpSocket(network, addr, fc)
if err != nil {
return
}
// If we don't need the proxy - then we should return default net.Dialer,
// otherwise, let's try to parse the proxyURL and return proxy.Dialer
if len(proxyURL) != 0 {
if dialer, err := getProxyDialer(proxyURL); err == nil {
return utpSocketSocket{us, network, dialer}, nil
}
}
return utpSocketSocket{us, network, nil}, nil
}
type utpSocketSocket struct {
utpSocket
network string
d proxy.Dialer
}
func (me utpSocketSocket) dial(ctx context.Context, addr string) (conn net.Conn, err error) {
defer perf.ScopeTimerErr(&err)()
if me.d != nil {
return me.d.Dial(me.network, addr)
}
return me.utpSocket.DialContext(ctx, me.network, addr)
}