1 // Copyright 2011 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build darwin dragonfly freebsd netbsd openbsd 6 7 package net 8 9 import ( 10 "os" 11 "runtime" 12 "syscall" 13 ) 14 15 func setDefaultSockopts(s, family, sotype int, ipv6only bool) error { 16 if runtime.GOOS == "dragonfly" && sotype != syscall.SOCK_RAW { 17 // On DragonFly BSD, we adjust the ephemeral port 18 // range because unlike other BSD systems its default 19 // port range doesn't conform to IANA recommendation 20 // as described in RFC 6056 and is pretty narrow. 21 switch family { 22 case syscall.AF_INET: 23 syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH) 24 case syscall.AF_INET6: 25 syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_PORTRANGE, syscall.IPV6_PORTRANGE_HIGH) 26 } 27 } 28 if supportsIPv4map() && family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW { 29 // Allow both IP versions even if the OS default 30 // is otherwise. Note that some operating systems 31 // never admit this option. 32 syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only)) 33 } 34 // Allow broadcast. 35 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)) 36 } 37 38 func setDefaultListenerSockopts(s int) error { 39 // Allow reuse of recently-used addresses. 40 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)) 41 } 42 43 func setDefaultMulticastSockopts(s int) error { 44 // Allow multicast UDP and raw IP datagram sockets to listen 45 // concurrently across multiple listeners. 46 if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil { 47 return os.NewSyscallError("setsockopt", err) 48 } 49 // Allow reuse of recently-used ports. 50 // This option is supported only in descendants of 4.4BSD, 51 // to make an effective multicast application that requires 52 // quick draw possible. 53 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1)) 54 } 55
