syncthing/lib/dialer/internal.go
Simon Frei 1bae4b7f50 all: Use context in lib/dialer (#6177)
* all: Use context in lib/dialer

* a bit slimmer

* https://github.com/syncthing/syncthing/pull/5753

* bot

* missed adding debug.go

* errors.Cause

* simultaneous dialing

* anti-leak
2019-11-26 07:39:51 +00:00

61 lines
1.4 KiB
Go

// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package dialer
import (
"net/http"
"net/url"
"os"
"time"
"golang.org/x/net/proxy"
)
var (
noFallback = os.Getenv("ALL_PROXY_NO_FALLBACK") != ""
)
func init() {
proxy.RegisterDialerType("socks", socksDialerFunction)
if proxyDialer := proxy.FromEnvironment(); proxyDialer != proxy.Direct {
http.DefaultTransport = &http.Transport{
DialContext: DialContext,
Proxy: http.ProxyFromEnvironment,
TLSHandshakeTimeout: 10 * time.Second,
}
// Defer this, so that logging gets setup.
go func() {
time.Sleep(500 * time.Millisecond)
l.Infoln("Proxy settings detected")
if noFallback {
l.Infoln("Proxy fallback disabled")
}
}()
} else {
go func() {
time.Sleep(500 * time.Millisecond)
l.Debugln("Dialer logging disabled, as no proxy was detected")
}()
}
}
// This is a rip off of proxy.FromURL for "socks" URL scheme
func socksDialerFunction(u *url.URL, forward proxy.Dialer) (proxy.Dialer, error) {
var auth *proxy.Auth
if u.User != nil {
auth = new(proxy.Auth)
auth.User = u.User.Username()
if p, ok := u.User.Password(); ok {
auth.Password = p
}
}
return proxy.SOCKS5("tcp", u.Host, auth, forward)
}