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// 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))
}
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