39 lines
1.3 KiB
Go
39 lines
1.3 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package net
|
|
|
|
import (
|
|
"os"
|
|
"syscall"
|
|
)
|
|
|
|
func setDefaultSockopts(s syscall.Handle, family, sotype int, ipv6only bool) error {
|
|
if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
|
|
// Allow both IP versions even if the OS default
|
|
// is otherwise. Note that some operating systems
|
|
// never admit this option.
|
|
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
|
|
}
|
|
// Allow broadcast.
|
|
syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
|
|
return nil
|
|
}
|
|
|
|
func setDefaultListenerSockopts(s syscall.Handle) error {
|
|
// Windows will reuse recently-used addresses by default.
|
|
// SO_REUSEADDR should not be used here, as it allows
|
|
// a socket to forcibly bind to a port in use by another socket.
|
|
// This could lead to a non-deterministic behavior, where
|
|
// connection requests over the port cannot be guaranteed
|
|
// to be handled by the correct socket.
|
|
return nil
|
|
}
|
|
|
|
func setDefaultMulticastSockopts(s syscall.Handle) error {
|
|
// Allow multicast UDP and raw IP datagram sockets to listen
|
|
// concurrently across multiple listeners.
|
|
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
|
|
}
|