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