mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-09 14:50:56 +00:00
78 lines
2.5 KiB
Go
78 lines
2.5 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 http://mozilla.org/MPL/2.0/.
|
|
|
|
package dialer
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"time"
|
|
)
|
|
|
|
// Dial tries dialing via proxy if a proxy is configured, and falls back to
|
|
// a direct connection if no proxy is defined, or connecting via proxy fails.
|
|
func Dial(network, addr string) (net.Conn, error) {
|
|
if usingProxy {
|
|
return dialWithFallback(proxyDialer.Dial, net.Dial, network, addr)
|
|
}
|
|
return net.Dial(network, addr)
|
|
}
|
|
|
|
// DialTimeout tries dialing via proxy with a timeout if a proxy is configured,
|
|
// and falls back to a direct connection if no proxy is defined, or connecting
|
|
// via proxy fails. The timeout can potentially be applied twice, once trying
|
|
// to connect via the proxy connection, and second time trying to connect
|
|
// directly.
|
|
func DialTimeout(network, addr string, timeout time.Duration) (net.Conn, error) {
|
|
if usingProxy {
|
|
// Because the proxy package is poorly structured, we have to
|
|
// construct a struct that matches proxy.Dialer but has a timeout
|
|
// and reconstrcut the proxy dialer using that, in order to be able to
|
|
// set a timeout.
|
|
dd := &timeoutDirectDialer{
|
|
timeout: timeout,
|
|
}
|
|
// Check if the dialer we are getting is not timeoutDirectDialer we just
|
|
// created. It could happen that usingProxy is true, but getDialer
|
|
// returns timeoutDirectDialer due to env vars changing.
|
|
if timeoutProxyDialer := getDialer(dd); timeoutProxyDialer != dd {
|
|
directDialFunc := func(inetwork, iaddr string) (net.Conn, error) {
|
|
return net.DialTimeout(inetwork, iaddr, timeout)
|
|
}
|
|
return dialWithFallback(timeoutProxyDialer.Dial, directDialFunc, network, addr)
|
|
}
|
|
}
|
|
return net.DialTimeout(network, addr, timeout)
|
|
}
|
|
|
|
// SetTCPOptions sets our default TCP options on a TCP connection, possibly
|
|
// digging through dialerConn to extract the *net.TCPConn
|
|
func SetTCPOptions(conn net.Conn) error {
|
|
switch conn := conn.(type) {
|
|
case *net.TCPConn:
|
|
var err error
|
|
if err = conn.SetLinger(0); err != nil {
|
|
return err
|
|
}
|
|
if err = conn.SetNoDelay(false); err != nil {
|
|
return err
|
|
}
|
|
if err = conn.SetKeepAlivePeriod(60 * time.Second); err != nil {
|
|
return err
|
|
}
|
|
if err = conn.SetKeepAlive(true); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
|
|
case dialerConn:
|
|
return SetTCPOptions(conn.Conn)
|
|
|
|
default:
|
|
return fmt.Errorf("unknown connection type %T", conn)
|
|
}
|
|
}
|