// 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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// +build darwin dragonfly freebsd netbsd openbsd
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package net
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import (
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"os"
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"runtime"
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"syscall"
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)
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func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
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if runtime.GOOS == "dragonfly" && sotype != syscall.SOCK_RAW {
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// On DragonFly BSD, we adjust the ephemeral port
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// range because unlike other BSD systems its default
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// port range doesn't conform to IANA recommendation
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// as described in RFC 6056 and is pretty narrow.
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switch family {
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case syscall.AF_INET:
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syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH)
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case syscall.AF_INET6:
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syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_PORTRANGE, syscall.IPV6_PORTRANGE_HIGH)
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}
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}
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if supportsIPv4map() && 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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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
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}
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func setDefaultListenerSockopts(s int) error {
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// Allow reuse of recently-used addresses.
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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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func setDefaultMulticastSockopts(s int) 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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if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
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return os.NewSyscallError("setsockopt", err)
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}
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// Allow reuse of recently-used ports.
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// This option is supported only in descendants of 4.4BSD,
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// to make an effective multicast application that requires
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// quick draw possible.
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))
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}
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