95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package dialer
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import (
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"net"
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"net/http"
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"net/url"
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"os"
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"time"
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"golang.org/x/net/proxy"
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)
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var (
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noFallback = os.Getenv("ALL_PROXY_NO_FALLBACK") != ""
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)
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func init() {
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proxy.RegisterDialerType("socks", socksDialerFunction)
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if proxyDialer := proxy.FromEnvironment(); proxyDialer != proxy.Direct {
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http.DefaultTransport = &http.Transport{
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DialContext: DialContext,
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Proxy: http.ProxyFromEnvironment,
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TLSHandshakeTimeout: 10 * time.Second,
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}
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// Defer this, so that logging gets setup.
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go func() {
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time.Sleep(500 * time.Millisecond)
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l.Infoln("Proxy settings detected")
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if noFallback {
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l.Infoln("Proxy fallback disabled")
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}
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}()
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} else {
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go func() {
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time.Sleep(500 * time.Millisecond)
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l.Debugln("Dialer logging disabled, as no proxy was detected")
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}()
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}
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}
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// This is a rip off of proxy.FromURL for "socks" URL scheme
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func socksDialerFunction(u *url.URL, forward proxy.Dialer) (proxy.Dialer, error) {
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var auth *proxy.Auth
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if u.User != nil {
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auth = new(proxy.Auth)
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auth.User = u.User.Username()
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if p, ok := u.User.Password(); ok {
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auth.Password = p
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}
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}
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return proxy.SOCKS5("tcp", u.Host, auth, forward)
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}
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// dialerConn is needed because proxy dialed connections have RemoteAddr() pointing at the proxy,
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// which then screws up various things such as IsLAN checks, and "let's populate the relay invitation address from
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// existing connection" shenanigans.
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type dialerConn struct {
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net.Conn
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addr net.Addr
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}
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func (c dialerConn) RemoteAddr() net.Addr {
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return c.addr
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}
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func newDialerAddr(network, addr string) net.Addr {
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netAddr, err := net.ResolveIPAddr(network, addr)
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if err == nil {
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return netAddr
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}
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return fallbackAddr{network, addr}
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}
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type fallbackAddr struct {
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network string
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addr string
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}
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func (a fallbackAddr) Network() string {
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return a.network
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}
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func (a fallbackAddr) String() string {
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return a.addr
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}
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