/
internal.go
94 lines (79 loc) · 2.12 KB
/
internal.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
// 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"
"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)
}
// dialerConn is needed because proxy dialed connections have RemoteAddr() pointing at the proxy,
// which then screws up various things such as IsLAN checks, and "let's populate the relay invitation address from
// existing connection" shenanigans.
type dialerConn struct {
net.Conn
addr net.Addr
}
func (c dialerConn) RemoteAddr() net.Addr {
return c.addr
}
func newDialerAddr(network, addr string) net.Addr {
netAddr, err := net.ResolveIPAddr(network, addr)
if err == nil {
return netAddr
}
return fallbackAddr{network, addr}
}
type fallbackAddr struct {
network string
addr string
}
func (a fallbackAddr) Network() string {
return a.network
}
func (a fallbackAddr) String() string {
return a.addr
}